Due to really toxic behaviour that will be no news to people on this topic, I've not spoken to my mother for 7 years and when I did last see her, at my Gran's funeral, she blanked me and dh totally. She left when I was 12 for my Dad's best friend, and it's always been hard. Due to this, my sister, who took my mothers "side" in this, also is estranged.
Anyway - my younger brother has just got engaged. Looking to get married in the middle of next year. I really don't know how to play it, he's the one who has kept in with both sides (very tactful). But mother and sister will be there. My dc don't remember their grandmother. Never met their aunt. I'm really worried!