It seems the "half" in this one is a girl, and the cop is Lou Diamond Phillips.
A proper sequel would be…Two Cops?
Cop and a Has-been.
The baby/little lady in Three Men and a Baby/Little Lady would be in her early 30s now.
Three Men and a Bride, obviously.
She dies in a freak accident and is survived by One Man and Three Babies.
Three Urns and an Octogenarian.
Problem Child 4.