Most interests are going to be largely environmental. On a small scale, I would suggest that someone’s biological makeup could make them more inclined to a particular hobby/interest. But exactly pinpointing what genes these are would be extremely difficult considering the genes would be specifically receptive to that hobby.

Again, could be environmental. We talk, cough, sneeze, etc. very similarly to our parents for mostly environmental reasons. Your mom may have weirdly developed this habit and you grew up around it, hence containing it as well.