C.W.
Hi SB-
I would be inclined to give out the flashlights...and do games using JUST those til the sibs/moms go home...then...after they leave...give the vests for the 'birthday crew'...
I think it is so very thoughtful of you to think of the sibs...but as a fellow seamstress...those projects can be pretty labor intense!!
Best Luck!!
michele/cat