CHILD SUPPORT

Let’s say that there is a mother who has a child by a man but they split. The woman has 1 more kid by another man and she splits with him as well. The first man pays his child support and more but the second man is a deadbeat. So the woman starts using the first father’s support check to cover her other child. So when the first father finds out that his child support is not all going to his child; would he be wrong to confront the mother and would the mother be wrong to defend her actions.