MIL rant

Does anybody else have issues where your MIL will try to parent your kids and basically disregard any rules/routines you have for them? I had to get going to drop off my SO's daughter at her mom's and my MIL sees my son carrying his swim trunks around so she changes him into them and let's him in the pool then takes off. Wtf?! Now I have to rip this happy little kid out of the pool to leave. And with my SO's daughter we have been limiting her iPad because she'll be on it all day long if she could. So her time is up and I take it away and what does MIL do? She pulls out her own tablet and gives it to her...that defeats the whole purpose of me taking the ipad away!!! UGH!!!