アメリカだとピューリタン教会みたいなもの。
[Wikipedia]
Capitol Hill Babysitting Co-op
https://en.wikipedia.org/wiki/Capitol_Hill_Babysitting_Co-op
The Capitol Hill Babysitting Cooperative (CHBC) is a cooperative located in Washington D.C., whose purpose is to fairly distribute the responsibility of babysitting between its members.
History
The co-op was founded in the late 1950s,[3] and as of 2010 continues to operate.
In 2010, there were twenty families in the co-op (down from its heyday of 250 families). Some of these are second-generation members of the co-op. It is open to new members.
