Both my husband and my entire family live in the same city, with the exception of my 2 kids and a couple of cousins. Before my generation, no one moved away. Both my kids went away for college. My son stayed for grad school, attended medical school at our state school, and then returned to his college town; I can not imagine he and his family every living elsewhere. My daughter moved to DC for a job, then a stint in the UK where she met her now husband. When they decided to move to the states, they moved with her company where she had worked with this team and made a few friends.
I believe neither kids want to be in the same city as either set of parents, but want to keep a close relationship. They both have toddlers, so the pandemic has made visits a bit more difficult. My daughter recently mentioned how hard it has been without family to help out occasional; they are having a tough time with WFH and parenting a toddler. While I think she would consider moving to our city, I don’t think my SIL is ready for that; our family can be a lot! D knows we would babysit anytime and have the kids spend the night; my kids spent many a night at my parents.
While husband and I would love to live closer to the kids, we both have living mothers, and I am the only child to help my mother; my husband is one of 4.