Mạnh-Quân'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-Tuấn, Minh-Loan and Minh-Vân. He was the second oldest of the four children. Mạnh-Quân is no longer alive.