Should I continue to see my sil and mil

My sister in law is living for a year in the US while her husband is overseas. She has 2 kids the same age as mine. I feel like my mother-in-law always feels sorry for her and her unmarried son all the time. My husband is the oldest and most responsible with money. They offered me a table to use recently and then said someone in the family would be using it. I called the family member and they said they didn’t even have a place to put it. My sil has always copied everything I have done as far as christenings,etc. She has always resented me because my kids are better behaved and cuter than her kids and she hears that from my mil. Financially, my mil is helping us to pay the bills since my husband had a pay cut but I help a lot with some inheritance I got. I want to go back to work but have been ill since a hospital stay in 2007. I recently applied for 3 jobs so I will never have to see any of them again. My mil and sil are two faced and I am sick of it. I told my husband it was either me or them. I have also provided 90 percent of all the furniture in our house and paid for the kitchen renovation in our last house.Bulldog80