I'm sorry to hear about your sister -- I'm sure it feels crummy to help out and not get support in return when you need it. The kind of help I was referring to could be on an individual basis, but it could also be at a community level. It's doesn't have to be a "I scratch my back, you scratch yours" scenario. We would *all* benefit from stronger support networks. As I mentioned in another comment:

"I think the single most important thing you can contribute is making an effort to build community. Maybe you don’t want to babysit, but someone down the street does. Organizing a block party, potluck, or regular gathering to help neighbors get to know each other and lay the groundwork for creating a mutual aid network would be phenomenal. If mothers these days want a proverbial village, they essentially have to build it and that’s just one more thing to do."