3DC, my parents are dead, sibling lives at the other end of the country. I was a single parent to dc1 for several years so only I looked after her, not me and a DH just me.
Now DH has a large, multigenerational but disinterested family, they all have multiple small children of their own and very different parenting styles to us, so childcare or favours have never been on the cards.
The answer to all of your questions here has always been friends.
I babysit for my friends, including those with several children, including those with co-sleeping and or breastfed babies, weaning babies,, overnight and at weekends and at a minutes notice and indefinitely for hospital stays and whatever is needed. I do exactly what is asked of me and don’t try to interfere which Is more than can be said for most family members as far as I can make out.
They babysit for me. Now my oldest DC is old enough to babysit, she babysits for them, and me, and earns good money doing it.
I’ve always wondered why babysitting is a family or paid stranger affair. Friends are the way forward. In addition I have great relationships with many of the DC as they’ve got older.
Friends. Babysitting circles. Tokens. Whatever you need, create it.