Do you think my boyfriend will be upset if I ask him not to bring his kids to my birthday dinner?
I think he might be upset by that. Why don't you want him to bring his kids to your birthday dinner?
I spend so much time with them, I want my birthday to be more adult focused.
Tell him how you feel and that you want your birthday to be more of a grown up occasion. I'm sure he'll understand and try to help him make arrangements for childcare for the kids. If he can't leave them, you may have to accept that the kids will have to be present.
No, I don't want them there. It's my special day and I should get what I want.
I understand how you feel, but children are a big responsibility and part of your boyfriend's life. You have to understand that sometimes we have to put the needs of others before our own. I'm sure you'll find a way to make your special day great!