tips on how to deal with inlaws

I really need some tips or advice on how to deal with my husband's grandparents. They hate me for whatever reason. I'm a genuine person.I'm always nice and respectful .At this point they are literally making up things to hate me for.When I'm not around they will complain about me to my husband .He recently had to stick up for me and tell them to quit talking about me.What should I do?