Is anyone familiar with how child support works?

My boyfriend’s ex wife is constantly asking him for money. She would first use the kids as an excuse. She also will just come up with a sob story sometimes. It’s clear she’s not using the money for the kids. They divorced because she got strung out on drugs, and cheated on my boyfriend. (She is apparently clean now.) The kids don’t even live with her full time. They live with my boyfriend’s parents full time, and they only see her on the weekends. As well as some holidays. The only reason why they don’t live with my boyfriend, is because he is active duty military. Once his contact ends in 3 years, the kids will live with us full time. My boyfriend is very kind with a big heart. I hate to see him get taken advantage of. I can clearly see his ex wife is manipulating him. This is the only thing that causes him and I to argue. I told him he doesn’t owe her anything. Only the children, and being a great father to them. Whenever he doesn’t respond to her, or doesn’t send her money. She starts to threaten she will go after him legally, to collect child support and take the children away. This is causing drama between my boyfriend and I. Can she collect child support, when the kids don’t even live with her full time?

Is anyone familiar with how child support works?
Post Opinion