I do not have the habit to call my mil mum or fil Father.. cos I am not staying with them .. and have bad impression with them. Not in good terms too. So when I didn't called them Mother or Father, my hub say I got no manner. What can I do?

My PILs are very mean and rude towards me. My mil ask my husband to divorce with me as I gave birth to two girls. They both invaded my privacy whenever they come my house by digging my cupboards and letter; then go around telling people what good food I eat without them in my "own house". However, I still greet them every time I see them, not because I scare of them but they are my husband's parents. I told them off when they did something wrong but I still respect them as I don't want my girls to learn the wrong way.