When Jacobus Petrus Lameir was born on 6 April 1895, his father, Cornelis Amandus Lameir, was 34 and his mother, Johanna Smout, was 27. He married Elisabeth van den Boom on 25 April 1919, in Hoogerheide, North Brabant, Netherlands. They were the parents of at least 1 son and 1 daughter. He died on 12 December 1943, at the age of 48.