I don't know who to go with..!

It's amazing that i got the ticket for free, but i don't know who to go with.

First: it's because mom and dad are going to my aunts' 50th birthday

Second: i want to go with a friend of mine but my friend's sister tells me to go with her!

My friend's sister is like persuading me to go with her, because she wants to see 2PM so bad... now i don't know who to go with.. i think i'm just gonna stick with my friend because she's so damn happy when i told her, and i want to know her sister too..