Seating Question..

ok.. so i'm still missing a # of RSVPs with today being the cut off (we'll see what comes in the mail today.. but i know it's not gonna be all 50 ppl..lol) ... but out of most of those ppl i know who is coming and who isn't.. some ppl just haven't sent them in.. don't know why...

anyway.. i started a seating chart with the people i know are def. coming ( Family table, and bridal party table) ...
My bridal party is 10 ppl... plus 1 FG and 1 RB.. and guests of the BP)

i have 1 table set.. i can fit 10 - 12 at a table.. the RB and FG are twins.. and both are my Matron of Honor's children.. so obviously i am seating them with her. so that's 4 people right there. The other people i have at the table in the BP only know eachother... the rest of my BP know others so i can mix them with another table..

my problem is.. it adds to up to 13 at the table. Do you think i can leave it that way being that 2 of the ppl sitting there are 4 yrs old??? They are having someone come pick them up to leave early ( mom is staying at the hotel and the wedding ends at 1:30am).
I am a Chateau briand bride... anyone have this problem??? I'm wondering what i should do.. i know that 13 is cutting it close.. and i want everyone to be comfortable when they sit for dinner.. but i haven't been able to work out another solution yet. TIA