As someone from an Asian background that grew up in the United States, I'm shocked at how many of my friends parents refuse / don't want to look after their grandchildren. My parents watch our kids multiple times per week, and I seemed to have married a relative unicorn amongst Anglo-Saxons because my in-laws watch them as well.
I think this is a highly under-rated reason why birthrates are falling. Grandparenting is actually a big deal, and we need to encourage it more. It's like the fatherhood campaigns we used to have. Don't be a deadbeat grandma / grandpa... it's not cool.