Pros and cons living with mother in law

i am nothing but thankful for my MIL. she helped me so much. She comes over on weekdays to stay if she is WFH and does almost everthing for the baby. cook meals, bathe him and putting him down for naps or sleeps. weekends she goes back to her own home so we can have family time. the only downside would probably be maybe they sometimes feed your kids whatever they like? it may be abit worrisome if they fed them something and not tell you and if they get an allergy, can be hard to pinpoint. oh and also, its hard to sleep train my baby when she is around as my MIL couldnt bear to hear him "cry it out"