Rosslyn was born in Gulgong on 27/08/1918.

He married to Joan May Gloede in Sydney in 1953. Joan was born in 1916 in Parkes.

It is unknown if they had any children. On the electoral roll for 1977 they were both listed with the profession saleswoman/salesman. In 1980 Joan was listed as saleswoman.

Rosslyn died in Homebush on 31/12/1979.

Joan died on 15/01/1987 in Homebush.