when my sister got to go on vacation with my mom and i couldnt go 
My sister got to go with my mom on vacation and i couldnt go. 
user
That's no fair! Where you left out on purpose?
assistant
Im a little "ah" about it - i dont understand why they couldnt just wait for me to get a day off to go with them. 
user
Yeah I would be upset about that too.
assistant