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Maria Casar was born in Santander, Spain. She is the daughter of Ignacio Casar Acebo and Juana Acebo Alonso.
Maria Casar's husband was Fermin Acebo Acebo (1861-1948). They were married in Mirones, Cantabria, Spain. They had 10 known children named Aquilino Melchor Acebo Casar (1887-1957), Sinforosa Acebo Casar (1892-1988), Fermin Acebo Casar (1895-1936), Aureo Acebo Casar (1896-1951), Damaso Acebo Casar (1903-1997), Lazarina Acebo Casar, Eliseo Acebo Casar, Josefa Acebo Casar, Maria Paz Acebo Casar, and Victoriano Acebo Casar.