My dad actually convinced me to start making Reap shortly after I illustrated a children's book for his company. He basically asked if I had fun drawing for it, and told me to just do it, tell my story. In fact, every time I go on hiatus he gets a little worried that I had given up on it. I'm pretty sure that he and my mom are the only ones in my family that actively read it. I think my sister does every so often, but she just doesn't like reading.
My extended family on the other hand, on my mom side probably either don't read it at all, or have and are a little scared of me. Hell, one of my uncles, when he was still alive and long before I started making the comics was in fact scared of how often I drew macabre stuff.
On my dad's side, I don't really know, I'm sure that if they have they would at least appreciate that Emerald is Jewish