Family advice... help!!?

Tell her that,this trip is for immediate family only, that this is a private holiday a trip down memory lane for your father that you are sorry but you have to respect your fathers wishes that this is a private journey he wants to share with your mum , brother etc. Also let her know that the home you are visitin is way to small.Tell her to respect your fathers wishes as this may be the last time he may be able visit this place. She sounds selfish and desperate for approval. Many mithers need breaks but only a few manage it she made her choices now its time to live with them. If she falls out with you would it be a great loss? Best of Luck