There's quite a bit of collecting on my dad's side of the family!
Great grandma - Chicken everything; her house is full of chicken art and figures and stuff. Boston terrier stuff as well, to a much lesser extent.
Grandma - Dolls and sewing patterns. She also has a ton of fabric and general sewing supplies, but I don't know if she'd call it a collection. Next time I visit I'll be taking home her dolls.
Great aunt - Also dolls, though I never really realized it growing up. I always thought of her sister as the doll collector. She also collects Precious Moments figures, I think it was, and vintage teddy bears. The bears are her main focus and I own most of her dolls now.
Different aunt - At one point she collected Living Dead dolls but I don't know if she still does.
And then of course there's also my boyfriend who very passively collects historic things, interesting coins, and glass bottles.