Son of the late Mugo Mweja and Daina Nyambura Mugo. Husband of late Beatrice Njoki Macharia. Father of the Late James Maina, Jane Wangari, Isaac Irungu, Esther Muthoni, David Mwenja, Paul Mutaga, Rose Mary Wangechi and Florence Wahu. Brother of the late Paul Mweja,AliceWangeshi Muchiri, Leah Muthoni Gachachi, Ziporah Mukami Maina and Ann Wanjiru Leaky. Father-in-law of Wilson Maina Gatario, James Mwangi, Esther Wanjiru, Mary Mugechi, Daniel Muli and Hennery Karanja. Grandfather of many.