Cut a long story short i have never got on with my mother in law. She made it very clear from the offset threatening me that we shouldn't be together because im 11 years older. Anyway over the years a lot has happened. My husbands brother is 20 lives at home with his mum is in all kinds of mess, takes drugs, has people turning up at mother in laws house to find ect ect. A few months ago after his brother lashed out and smashed up his mums house, tvs and car. Me and my husband made the decision that we dont want our 3 year old son around his uncle and told my mother in law and rest of the family. Me and mh husband only ever argue over his family because I feel he tries to keep the peace and dosent always stand up for me when shes in the wrong. Fast forward to today... she asked in the week to have him which i agreed. I asked what the plans where as we like to know who our sons with and what hes doing, as you would as a parent. She ignored us. Asked her again today she said dont know yet amd shes capable of looking after him. My husband called her after 3 hours and no answer. Finally got hold of her and turns out she had arranged for her whole family to go for a meal for his brother (the one who we dont want our son around) birthday!! She deliberately went behind our back and did it anyway. I demanded my husband go and get hom which he did. I am fuming. What do I do now to address this? Maybe contact only with me or my husband there? Shes lost all our trust.