My sister in law the (insert word here) in Life Lessons

So I know this shouldn’t bother me but something about me is I want everyone to get along with me, I don’t want to have problems with anyone, especially my family.
I’ve had lots of problems with my mother in law and sister in law - they are super rude to me and unwelcoming…
Anyway my sister in law has now recently been going around telling everyone that they (her and her parents) doing talk to us anymore and that we don’t want to be apart of their family anymore (which is a lie) all because we don’t spend every holiday with them and we don’t drive 3 hours on a weekday to see them on their birthday.
I am at a complete loss - honestly I’m fine not associating with them but I feel bad for my husband because him and his dad are close… I just don’t know how to bring up the conversation of what they hate me so much.
They both like to cry a lot to get their way and it’s annoying.
I’m at a loss as to if I should bring it up or act as if nothing is wrong? How do I be around them when I know they say bad things behind my back? What do I even say? How do I bring it up?