I wear women's size 10.5 (hard to find) mostly. My feet were size 10 when I was 10.
DD is 13, wearing women's 7 or 7.5. Her feet stopped here last year.
DD2 is 11, wearing kids' size 4.5. I'm expecting her feet to get bigger quickly this year.
DS is 7 1/2, and has very short feet--I just bought him 13 1/2.
DD3 is 5, and has tiny feet, wears size 8.5. Size 9 is too big. I have a bag full of size 10 little girl shoes waiting for her to grow! I keep buying shoes...
DD4 is 2 1/2 and has good sized feet--7 1/2 wide.
DH has small feet for a guy; wears about size 8.5 mens (not wide). I have big feet. I'm tall-ish, he's average height. It really makes an odd mix for our kids.