Riaz was born in 1972 to an aristocratic Muslim family in Faridpur District, Bangladesh. Riaz is the youngest child in his family. He has six sisters and a brother, Raisuddin Ahamed Siddique. He was brought up in CNB staff quarters of Faridpur for the first sixteen years of his life.[5] His father, the late Zainuddin Ahamed Siddique, was a government service holder. His mother was Arjumand Ara Begum. His paternal home is in Jessore District. His father died in 1988. After the death of his father, Riaz moved to Jessore district in 1989.