Yeah, that's what I was thinking. Not sure on costs, but the following might get us close or provide a place to start.
Inn Stay (common): ~5 sp / day each x 8 kids = 40sp = 4gp / day
http://www.d20pfsrd.com/equipm...gs-servants-services
Nurse: 7 sp / day
http://www.d20pfsrd.com/equipm...vices/#TOC-Hirelings
So my math says 5gp / day ought to buy us a nanny and feed these kids pretty well. That'll be 150gp / month or so. They'll probably need some blankets, clothes and so forth, but I believe there's enough cushion in the 5gp / day to cover much of that too.
Eventually, we'll need a tutor and perhaps a martial trainer... ;-)
So each of us pitches in 25gp / month? How's that sound GM? Am I on track? High? Low? I do estimates for a living, so let me know everyone! ;-)