What were the names and ages of the Defeo family?

The Defeo family, who were tragically murdered in their home in Amityville, New York, in 1974, consisted of six members. The parents, Ronald DeFeo Sr. (43) and Louise DeFeo (42), had four children: Dawn (18), Allison (13), Marc (12), and John Matthew (9). The family's ages ranged from 9 to 43 at the time of the incident.