"Monching," as he is popularly known, married Cecilia Aldeguer Blanco in April 1959; they had six sons, who are politically active. The third son, Ramon "Mon-Mon" Mitra, who graduated from the Philippine Military Academy in 1988, served in the Philippine Marine Corps, ran for a senatorial slate for May 2010 elections of the Nacionalista Party but lost. The fourth son, Bernardo Mitra, has been working for government in various capacities since 1989. The youngest son Abraham Kahlil Mitra, was the governor of Palawan from 2010 to 2013.