Should i invite my cousin's in law to my wedding

So I am really struggling with the situation. My cousin is probably the only family I have in the state, but she's a person kinda like to taking advantage of me and my family. So I decided not to let her to be the bridesmaid considering she has two kids and her in laws will need to take care of the kids. I am not really familiar with her in laws, we probably only met couple times for 5years, so I was not planning on invite them. My cousin was upset that I didn't ask her to be Bridesmaid so I said okay ,I can add one,like you and your husband can both be Bridesmaid and groomsman to make it even. I keep asking her check with her husband and inlaws if they are fine with that. After I purchased morning robe, clothes and flowers for bridesmade,she suddenly said she can not do it cause her in law can't take care of two kids. And she turned to say it's me begging her help to be bridesmaid and it's really bad that I am not going to invite her in laws to the wedding, if I did that then she and her husband can be bridesmaid and groomsman. She also mentioned that a mutual friend said it's bad of me not going to invite my cousin's in laws. I told her we are not familiar and I said my husband has two half sisters who he doesn't talk for long long long time cause they are pretty bad and she said you guys are perfect for each other. I said not as good as you guys. I told my husband about it and he's pissed and said definitely not going to invite my cousin and the mutual friend. However,my parents request me to invite her cause she's my cousin. So what should I do ?