Five teenagers have been charged after the fatal stabbing of a 16-year-old boy at a party in Sydney earlier this year.

Aidan Smith,16, was killed when knives and weapons were used during a vicious brawl at an 18th birthday party on Victoria Road in Ryde on August 7.

Yesterday, police arrested a 15-year-old boy and two 17-year-old boys. The trio were taken to Hornsby Police Station and charged with affray.

A short time later, a 19-year-old man handed himself into police. He was also charged with affray.

A fifth boy, aged 16, was also arrested today, with the group all waiting to face court.

Aidan Smith. (Supplied)

Shortly after the fatal stabbing, a 20-year-old man was also charged with affray.

Paying tribute to her brother, Aidan's sister, Nova Smith, said her brother was "always happy".

Read more : Sister pens emotional tribute to teen fatally stabbed at Sydney party