So when my fiancee and I were talking about budget for our wedding we both talked to our parents to see how much they could contribute. My parents agreed to half the cost (and I wanted a really in expensive wedding) while we both knew his parents, who were divorced, couldn't really afford that much to contribute. He asked if they wanted to help out and how much they could because every little bit helps. (He is his father's only child, his mom was married previously). His mom decided to contribute 100 every month and his dad agreed to 50. We told them both only agree to what they can afford because we just wanted to know how much money to budget for.
Anyway, his dad ended up falling through. He freaked out at my fiancee and said he'd been been pressured into it or something. He was really rude to my fiancee and didn't answer his calls when all my fiancee wanted to do was tell him not to worry about it if it would tax him too much. So they ended up having a big fight, not about the money (which would have just been extra anyway because we didn't expect his father to be able to help out) but about how poorly his father treated him. (It was really crazy.)
So my question isn't about that but the groom is supposed to give a speech thanking guests at the wedding. My parents have contributed a lot and his mother has gone above and beyond. She ended up giving 200 because she was able to get a better job and really wanted to help out. I know how much it means to her to help and I don't think it would be fair to thank my parents and both of his parents for helping us put on the party. His mom deserves the credit because she really helped, his dad doesn't even want to talk about wedding stuff with my fiancee. But at the same time, he loves his father and we don't want him to feel slighted when he gives the speech at the reception. So what should we say? Thank my parents and his mom and then what?