My husband's parents died long time ago. He lost his dad when he was only 2, and his mom after we got married for only 3 weeks... . So, I am VERY sorry I never really got to know them! My mom-in-law was a real sweetheart, but by the tiùme I met her, she was so sick already.
My parents still live. My husband gets along with them, but not completely, especially not with my dad. He has a bit the same attitude as your in-laws: when my dad gives us some money or something else, he always gives it to me! He is almost 82 now, so it's to late to change