Let's start from the beginning...

Her mother was Danica Rosić and her father was Vojin Abramović. (http://archive.is/wpDtj#selection-1351.212-1351.275))

So I do some digging and I find this...

29.08. 1880. Rođen u Pljevljima Petar Đ. Rosić Varnava Varnava Rosić (Serbian Cyrillic: Варнава Росић) was the Patriarch of the Serbian Orthodox Church between 1930 and 1937.[1] He was born Petar Rosić in Pljevlja, belonging at that time to the Ottoman Empire, on August 29, 1880.

His brother was called Uros who married Milica Vojinovic from a powerful merchant family.

Vojinović (Serbian Cyrillic: pl. Војиновићи) was a medieval Serbian noble family which during the 14th century played an important role in the Serbian Empire, especially after the death of Emperor Dušan (King 1331–1346, emperor 1346–1355), when during the Fall of the Serbian Empire its representative Grand Dukes Vojislav Vojinović (around 1355–1363), and later his cousin Nikola Altomanović (1366–1373) were the strongest district masters in Medieval Serbia. (https://en.wikipedia.org/wiki/Vojinovi%C4%87_noble_family)) Google translated: UROŠ (1885 - 1937) he was a trader with his brother Alex. He was married with Milica Vojinovic from Uros with whom he had four children: Danica Day Abramovic graduate. history. (http://archive.is/C39LC#selection-963.0-965.171))

So Danica Rosić, Uros daughter was Marina Abramovic's mother making Rosić Varnava Marina great uncle...

Don't believe me? Check out what it says on Wikipedia...

Varnava, Serbian Patriarch He was the great-uncle of performance artist Marina Abramović. (http://archive.is/YPzcy#selection-681.0-685.1))

So they I do some more searches and I find his mention in 'Rasputin: The Biography'...

Slight and short with a high-pitched voice, Varnava, it was rumoured, liked to wear women's clothing,throw wild parties in the monastery, and take boys to his bed. Father Georgy Shavelsky, the last protopresbyter of the Imperial Russian army and navy, characterized Varnava in a letter to Father Vostokov as a cunning and nasty figure of unhealthy ambition. He said Varnava was the confessor to "that Mason Count Witte, and is himself an atheist -Mason." Shavelsky even claimed Varnava had sexually abused and then murdered a beautiful young altar boy at Kolomna, his body discovered lodged under a mill wheel.

Researching this Witte fellow:

Witte was a highly influential econometrician, minister, and prime minister in Imperial Russia, one of the key figures in the political arena at the end of 19th and at the beginning of the 20th century. https://en.wikipedia.org/wiki/Sergei_Witte Witte's position was not established. The Liberals remained obdurate and refused to be cajoled. The Peasants' Union asked the Russian people not make redemption payments to the government and withdraw their deposits from bank that might be subject to government action. He promised an eight hour working day and tried to secure vital loans from France to keep the "regime" from bankruptcy. Witte send his envoy to the Rothschild bank; "they would willingly render full assistance to the loan, but that they would not be in a position to do so until the Russian Government had enacted legal measures tending to improve the conditions of the Jews in Russia. As I deemed it beneath our dignity to connect the solution of our Jewish question with the loan, I decided to give up my intention of securing the participation of the Rothschilds." Witte was much admired in Russia but he made some powerful enemies, including Vyacheslav Plehve, Minister of the Interior. In August, 1903, Plehve passed on documents to Nicholas II that Witte was part of a Jewish conspiracy. As a result Witte was removed as Minister of Finance. (http://spartacus-educational.com/RUSwitte.htm))

Here is the kicker though...

Varnava and Rasputin met in one of the capital's salons, and if they did not become friends, the two men of similar backgrounds apparently realized they could be of use to each other: Rasputin could help advance Varnava's career, Varnava could defend Rasputin against attacks from within the ranks of the church. (https://books.google.com/books?id=npKqDAAAQBAJ&pg=PP208&lpg=PP208&dq=Varnava+mason&source=bl&ots=OVSuRnrREm&sig=4xq-jUE8eAf131wUfKpEFIkjZlM&hl=en&sa=X&ved=0ahUKEwivpdDSu-fQAhXFWxoKHYISBygQ6AEIGjAA#v=onepage&q=Varnava%20mason&f=false))

If you haven't heard of Rigori Yefimovich Rasputin was a Russian peasant, mystical faith healer, and trusted friend of the family of Nicholas II, the last Tsar of Russia. He became an influential figure in Saint Petersburg, especially after August 1915, when Nicholas took command of the army fighting in World War I. Advising his wife Alexandra Feodorovna in countless political issues Rasputin became an easy scapegoat for Russian aristocrats, nationalists and liberals.) (https://en.wikipedia.org/wiki/Grigori_Rasputin))

There is a lot of mystery around Rasputin, some say he is evil while others claim that we was framed.

Link to book claiming he was setup: (https://books.google.cz/books?id=eLqVMOmEsisC&pg=PA262&lpg=PA262&dq=Rasputin+mason&source=bl&ots=XPNlwWHqnu&sig=CHruviWNm9UJtlKXyxxWIs2kIog&hl=en&sa=X&ved=0ahUKEwi52ZSS5unQAhVJliwKHYK1DhI4ChDoAQgaMAA#v=onepage&q=Rasputin%20mason&f=false))

Link to article claiming he was setup by the freemasons:

To understand just why the masons conceived this campaign of slander against Rasputin, you need to have some knowledge of the nature of their organization and its activity. In Russia the first Masonic lodges emerged in the 18th century as branches of the West European ones, reflecting their political interests. The newfound Russian masons wished to west-Europeanize Russia. "The stronghold of the Masonic infiltration in Russia was the part of the ruling class and educated society that was farthest from the popular masses, and as such knew next to nothing of the national traditions, roots and ideals, and even despised them," Oleg Platonov writes. "This predetermined the anti-Russian character the Masonic movement adopted in this country, a fact that has hardly changed to this day. Hiding behind slogans such as "Freedom, equality, fraternity", "For the enlightenment and happiness of Mankind", leaders of these Masonic lodges spun intrigues against representatives of state power and the Russian Church. The leaders of Masonic lodges never revealed their ultimate goals to rank-and-file members, since their organization was strictly clandestine. That’s why sometimes it happened that unsuspecting honest folk were deceitfully tricked into joining the organization. (https://www.geni.com/people/%D0%93%D1%80%D0%B8%D0%B3%D0%BE%D1%80%D0%B8%D0%B9-%D0%95%D1%84%D0%B8%D0%BC%D0%BE%D0%B2%D0%B8%D1%87-%D0%A0%D0%B0%D1%81%D0%BF%D1%83%D1%82%D0%B8%D0%BD/6000000010908111622))

Video claiming he is one of the most evil people in history (https://www.youtube.com/watch?v=PBUYbQDlYss))

More info though not personally verified through other sources. Maybe someone can help with that...

Her maternal uncle was the powerful Varnava Rosić– Patriarch of the Serbian Orthodox Church between 1930 and 1937. His body is interned at the Temple of Saint Sava in Belgrade. He believed that Hitler’s policy toward Jews and lesser races served all mankind. His last act was to oppose a Vatican Concordat to control the Orthodox Church. Knights assassinated him with poison before the final vote. The (Orthodox) Temple of Saint Sava in Belgrade, Serbia is the largest Orthodox Church currently in use. The church is dedicated to St. Sava, founder of the Serbian church and an important figure in medieval Serbia. From its location, the temple dominates Belgrade’s skyline and is perhaps the most monumental building in the city. Saint Sava (1174 – 1236), was known as The [Luciferian] Enlightener. He was a Serbian prince and Orthodox monk, the first Archbishop of the autocephalous Serbian Church. He was a prince of the House of Nemanjić descended from a Cabet Vukanovic Dynasty (1106- 1166) line of Hugh Cabet. I believe that this is Marina’s secret maternal East European Merovingian BLOODLINE, the House of Nemanjić.

(http://archive.is/ZWPwP))

Though I haven't found a direct link I believe that the name Rosić links to the Rosicrucianism secret socitey... WEAK LINK but maybe someone can find something...

Rosicrucianism is a philosophical secret society said to have been founded in late medieval Germany by Christian Rosenkreuz. It holds a doctrine or theology "built on esoteric truths of the ancient past", which, "concealed from the average man, provide insight into nature, the physical universe and the spiritual realm." Rosicrucianism is symbolized by the Rosy Cross or Rose Cross. (http://archive.is/5XW0G#selection-1289.0-1289.383))

(http://www.artnet.com/artists/marina-abramovi%C4%87/artist-portrait-with-a-rose-a-UFCh9RtcaGiFZmmJxBYKcg2?))

Is this for real? How deep does the rabbit hole go?!?!

EDIT: Added more info on Varnava Rosić

EDIT: User pointed out that Varnava was misspelled in some places due to me using image to text converter. Fixed spelling.

EDIT: Sorry if people feel the title is clickbaity. I was genuinely shocked by what I found. Also the links that I provide which I did not have time to personally verify are hopefully clear in my post. I am an open minded individual and if anything I have posted is wrong I invite you to clear the air. I respect people challenging my findings and invite people to seek the truth even if it means proving me wrong.

EDIT: Updated family background with some errors and additional findings