Mother-in-law

Does anyone else have a super overbearing mother-in-law? My kids arent biologic mine and before paper work had not been done yet making them mine my MIL took my husband to court to get visitation one day a week afterschool until 7 pm and one full weekend every month. The court granted this... (we let her see the kids when ever she wanted and hardly ever told her no unless we had plans alresdy) During these weekends she will plan birthday parties for our kids behind our backs and not invite us. Her sister is also with her the entire time she takes the kids and her sister Is very racist and makes fun of individuals with disabilities in front of my kids. The sister also doesn't like my husband and I and she makes rude comments to my kids about us. I confronted my mother in law about all of this and she doesnt see an issue with any of this. What should I do?