Monday's funeral for Steven and Linda Kologi and their 18-year-old daughter, Brittany, was held at St. Jerome Roman Catholic Church in West Long Branch. It came two days after mourners had gathered there to remember the fourth victim, 70-year-old Mary Schulz.
Monmouth County prosecutors say the Kologis' 16-year-old son shot the victims at close range with a semi-automatic rifle in their Long Branch home.
Schulz was the longtime partner of Steven Kologi's father, who also was in the house but escaped unharmed with two other people.
Authorities said they still don't know why the shootings happened, even as it emerged the family was facing financial hardship.
"At this point, we don't have a motive," Monmouth County prosecutor Chris Gramiccioni said.
The suspect's name has not been released because of his age, but authorities may seek to move the case to adult court.
(The Associated Press contributed to this report)
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