I'm not sure how normal or not my story is, but... we're 4 generations in the same mid-sized eastern US city.
My grandmother sold my parents her house when they got married in the early 70's, over the years various uncles and aunts lived there, sometimes with little ones as they got on their feet. even after my brother and i were born, our uncle lived with us for a year. as we grew up, my mom wanted to make a career, and went to nursing school. my grandparents on both sides watched us a few days a week as my mom spent time being a mom and being a student. those are some of my favorite memories, and they seemed to get a lot of our the experience too. over the years, it just became normal to me that family lived close, and that sometimes family members live with you. we all got along pretty well as a family. (nothing was ever perfect, but everything was always functional and healthy).
our generation was the first to all go to college - i was the youngest, and when i finished college the market was in the tank (dot-com bubble with a tech degree). so I moved in with my parents until I found a job in my field, since i had no money, and very low income from a data-entry job i took while i looked for a job (honestly, i hated that job, but i took it because i didn't want my parents to think i was going to be a leech). we wound up having a blast living together as adults, in a way that we couldn't when i was still someone they felt like they had to parent. i found a good job after about 3 months, but stayed there for another year building up savings before I moved out. i wanted my own space, but more of it was that culturally i didn't feel like an adult when i lived with my parents, and i thought it would hurt my career, and it was not ideal to have a girlfriend in that environment (at 22 i wasn't really thinking of a wife yet). ...since then I've established my career, got married, and had kids, and kept living close to family. (2 miles from my parents, 1/2 mile from my brother, and about 15 miles from my in-laws). ...we've always had someone living with someone else somewhere in the 1st-level extended family. soon - my in-laws are going to consolidate with my wife's grandmother.
we lean on the grandparents to help us with the kids a couple of days a week while my wife and I work. one day, I'll be happy to help my kids out in whatever ways they need it. because i'll only ever be able to pay forward.
despite that - it was never a thing of a handout. there was always this underlying message in our family of, we're here to support you - but you'll only get as much as it seems like you're trying for. effort was what counted, instead of results - which i think was a good thing for a family.