So my brother turns 19 this year and has his birthday the same day as one of my closest friends who turns 21. 
Originally my brother told me he was going to come out with me and my friends for his AND her birthday (my brother lives 4 hours away from me and was going to come for the whole weekend).

However, my mum ended up planning a weekend with the family (Aunty, uncle and cousins) to go down there (they live where I live) for his birthday. 

My mum forgot to tell me so I’ve made plans to go out with my friend and made payments for party busses etc that are none refundable.. 

Am I the asshole for missing my brothers birthday? 