that is owned by his brother-in-law and sister

Mateen and wife Noor Salman were living in a Fort Pierce apartment at the time of the

The brother-in-law of Orlando terrorist Omar Mateen has refused to deny that he knew about the shooter's plans to commit a massacre at Pulse nightclub.

When asked directly by DailyMail.com whether he knew of Mateen's intentions Mustafa Abasin, 43, refused to comment, saying he could not talk.

Standing at the front door of the Port St Lucie home, which he shares with wife Sabrina, 31, Abasin similarly refused to respond to questions regarding the land deal between himself and Mateen, 29, that saw the terrorist transfer the deeds to his Fort Pierce for just $100.

The property is worth an estimated $165,000.

The bizarre real estate transaction took place one month before Mateen's June 12 attack that left 49 dead and 53 wounded.

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Keeping quiet: Mustafa Abasin (above) refused to comment when asked if he knew about his brother-in-law Omar Mateen's attack ahead of time

Nothing to say: He would also not respond to questions about why his brother-in-law signed over the deed on his Florida home to him for $10

Home sweet home: Mateen, his father Seddique and his sister Mary purchased the Port St. Lucie home (above) together in September 2013

Asked by DailyMail.com, if he could explain why Mateen sold him his home for just $100 he said he could not comment.

When DailyMail.com put it to him that there was a suggestion that this meant he knew about his plans for the shooting ahead of time and asked, 'Did you know?'

He said, 'I will not comment, I will not comment.'

When asked if he had been questioned by the FBI and if he was helping them with their investigation he refused to comment.

On April 5, Mateen signed a Quit Claim Deed transferring his ownership in a Port St. Lucie residence to his sister and brother-in-law, Mustafa and Sabrina Abasin. They paid him $100 for the home according to city records.

Mateen's sister Sabrina (above) while live in his

One of the individuals who signed off as a witness to this sudden transfer was Noor Salman, Mateen's wife. The other witness was Mateen's sister Miriam 'Mary' Seddique.

Three weeks after signing his deed over to his brother-in-law, Mateen took a trip to Walt Disney World to scout out possible sites for the attack according to law enforcement officials.

He also brought Salman with him for that trip.

The Port St. Lucie home that Mateen, 29, gave to the Abasins is worth approximately $165,000, and he owns a third of the property. So it is unclear why Mateen would be willing to sign it over so suddenly and for no money.

It is a 1,740-square-foot residence with three bedrooms and two bathrooms on 10,000 square feet of land.

Furthermore, mortgage records show that in September 2013, less than three years ago, Mateen borrowed $76,000 from Seacoast National Bank to purchase the home along with two other family members.

His father Seddique and sister Mary also signed as borrowers.

Salman, 30, was named in the Mortgage as well but only as being the wife to Mateen, and she did not sign the document.

The Warranty Deed to the home was also signed by Mateen, his father Seddique and his sister Miriam. Salman's name is not on any of the documents.

Seddique also signed over his deed to the property in February of this year to the his daughter and son-in-law, and like his son only charged $100 according to the Quit Claim Deed and city records.

Mateen's sister Mary did the same too in April, giving the Abasins full ownership of the home.

The family has a sizable real estate portfolio city records show, with Mateen the only family member who did not own multiple properties. Many of the homes they purchased were bought with at least one other family member.

Mateen meanwhile was living in an apartment in Fort Pierce that was owned by his sister Sabrina and brother-in-law.

Losing money: The Port St. Lucie home is worth an estimated $165,000 and Mateen, Seddique and Mary borrowed $76,000 to pay for the home (Mateen with Salman and their son)

It was revealed on Thursday that Salman called her husband a little after 2am when his mother contacted her and said she was concerned about his whereabouts, a law enforcement official working on the investigation told CNN.

Mateen, who was just starting his brutal massacre at that time, did not answer, so at 2.30am Salman texted: 'Where are you?'

At that point Mateen responded, telling his wife: 'Do you see what's happening?'

When she replied back to that by texting 'no' he wrote: 'I love you babe.'

There were no text messages exchanged between the two after that, though Salman did call her husband again a few hours later during his standoff with police. He did not answer his phone.

It was also revealed on Friday that Mateen may have given his wife access to bank accounts and taken out life insurance policies in the past few weeks.

Investigators on the case are not revealing if Salman called authorities or 911 at any point during the shooting to identify her husband as the gunman, and the answer to that question could go a long way in explaining just how much she knew about the attack.

The FBI and federal prosecutors meanwhile are planning to bring evidence about Salman's role in the shooting in front of a grand jury to get her indicted on at least two criminal charges for her role in the attack - which could possibly include multiple counts of murder and attempted murder for each of her husband's victims.

Digs: Mateen and wife Noor Salman were living in a Fort Pierce apartment (above) at the time of the attack that is owned by his brother-in-law and sister

Dad: Patriarch Seddique's home (above) is on the same road as the home he previously owned and then deeded to his daughter and son-in-law

One more: Sister Mariam has multiple properties, but stays in this Fort Pierce home (above)

An FBI source told Fox News that a panel has already been put together to target Salman, who could be facing any possible number of charges.

That source also stated that Salman could ultimately be charged with 49 counts of murder and 53 counts of attempted murder for her role in the shooting, which the FBI has declared was both a terrorist attack and a hate crime.

If investigators find proof that she scouted out Pulse nightclub or went to purchase ammunition or firearms with her husband knowing about his plans, then under federal law she would be just as guilty of her husband's crimes.

Investigators have reportedly obtained surveillance footage showing Salman buying ammunition with Mateen days before the attack.

There are also reports claiming she told law enforcement that she drove her husband to Walt Disney World and Pulse nightclub to scout out locations.

It is unclear though just how much she may have known about her husband's plans, with the FBI and investigators on the case keeping quiet when it comes to that question.