Thumb sucking related to nail biting?

Anyone else think that thumb sucking/nail biting may be related? I was curious if they both had to deal with anxiety or if thumb suckers ended up biting their nails. I bite my nails, my middle daughter bites her nails, and my oldest sucks her finger. I usually bite my nails when I see an imperfection in my nail, so I have thought maybe this has something to do with my self-esteem. My daughter who bites her nails is pretty outgoing so I really can’t tell what’s going on in her head for her to start the nail biting, but it has been hard to get her to stop. My oldest daughter will suck her finger when she is getting tired. I don’t know if it is out of habit but it seems to be more of a soothing thing for her before she will go to sleep. I think everyone has their own reasons for their habits but maybe they are somehow related at the root of the problem.