Just some background, I am married with a two yr old and a 3mo baby. My parents go every year in spring and summer to Cornwall for a week. Usually I go in the spring with them and my sister goes in the summer because my sister has OCD, and other mental health problems so she finds it hard to share small spaces with other people. All of us are quite skint, my parents always book the same cottage because it is cheap. If they hadn’t invited us to go with them we wouldn’t be having a holiday this year as I am on Mat pay, so i am very grateful. However, it only has 2 small rooms (one the size of a small bathroom with 1 bed no wardrobe, the other has a small double and a single and wardrobe). My husband and the babies will sleep in the room with the double and single, my mum goes in the small room by herself because she is a very loud snorer and my dad sleeps on a bed that we bring downstairs (he and my mum have separate rooms at home as well). Also, my extended family want to come away with us so they’ve booked a separate cottage. Since my sister has found out they are going, she wants to come too, so my mum said she can sleep on the floor with her in the tiny room. All of this would be fine, except my sister is very hard to live with. Due to her OCD she spends hours in the bathroom, has showers at 2am, wakes up very late in the day, is generally moody most of the time and has screaming swearing arguments with my mum (imagine the worst argument you’ve ever witnessed, they’ve even gotten physical before). My mum does everything for her even though she is an adult like her washing and breakfast in bed. My sister has never washed up or anything ever in her life. Basically, I am dreading the holiday now she is coming as I already have two very small children who’s needs are very high. I can sort of see both sides as I don’t want my sister to be left out of the holiday as I feel sorry for her and I’m sure that’s how my mum feels too. I also realise it’s my mum and dad who are paying so it’s up to them. But at the same time, I wish she would have just let me have this week away since she gets to have one in the summer. What would you do? Would you go or not? Would you say anything? What should I do?