Yeah, it's hard! Sometimes it feels like all this stuff happens when we're already pretty low on connections and support and--well, practical assistance. I'm in the same spot, altho my D is a bit older and there's only one of her. I know you said that Themselves don't have a social network, but surely they have at least a friend or 2? I rely on a lot of carpooling and other parents who have a few less obligations than I have, and generally people are willing to help out, especially if you can arrange some play dates or whatever when you're not teaching, or offer to drive the carpool to whatever. It takes a lot of creativity and thinking outside the box, and yeah--generally moms are the ones with the connections and the wherewithall to do this.
M60 H52 D20 M14 yrs OW-old gf from 1986 bomb-5/18/08 H filed for D-9/10/08 D final 4/24/09 xH remarried (not OW) 2012