Mạnh-Tuấn was born in April 1967. Mạnh-Tuấn's father is Lâm and his mother is Minh-Tài Phạm thị. His paternal grandparents were Lan and An Lê. He had a brother and two sisters, named Mạnh-Quân, Minh-Loan and Minh-Vân. He is the second youngest of the four children.