I will try and keep this short and straightforward if I can.
My Aunt has a holiday home abroad which I spend the month of August in every year. My cousin bought a house in the same community last year. This year I stayed in his house for 6 days before I moved into my Aunts in August as usual.
My cousins sister stays in my Aunts house for two weeks in July every year. Next year she plans to extend her stay by staying in her brothers house too.
Anyway she told me to book my dates for my cousins house ASAP for next year as she had already requested dates. I text my cousin who said yes you can have the dates and I will put you in the diary.
Yesterday his sister text me saying she would like her mil and sil to stay in her brothers house for the dates I have already confirmed. They travel together every year but stay in the same house as my cousin. Obviously now that there's another house they want to stay there.
I rang my cousin who owns the house and he said, it's first come, first served as far as be was concerned. He then said if it suited me to change my dates that was fine but not to put myself out.
DH thinks cousin requesting the house for her in laws is a CF.
I don't want any bad feeling. If I do change dates it will also cost me significantly more as I need to find alternative accommodation.