Wedding Party Dilemma...Help!

So we're having a relatively small wedding at a restaurant with a 15 minute ceremony. I'm having my sister as MOH and FH is having his bro as BM. That's it.

Now FH has a niece and nephew (kids of BM) that are 6 and 3 and adorable. His whole family want to use them as FG & RB. I have 2 nieces & 2 nephews, both 16 (girls) & 13 (boys). I'd feel really strange to use his family but not use mine.
I know they're cute & adorable and everybody will fawn over them all, but using all will def be too much. How can I use his fam but not mine.

What would you do???

just say no to all
say ur are trying to make the ceremony focused all on u and ur FH and dont want a long precessional

my fam also was pushing for a bigger wedding party but I made it clear that its not what I want, I just kept my ground

Was in a similar situation...just chose not to have any kids involved in the ceremony.

They're invited to the wedding, just not in the BP.