My little brother, we'll call him D, seems to lack empathy for others. I began to notice it when our cat died. He was 4, and he didn't seem to care. He didn't cry, there was nothing. We explained it to him (parents told him the cat was in Heaven with God) and that was that. He doesn't seem to miss him, he mentions him a lot but not in a sad way, in an almost humorous way. Another time is with a wild rabbit a few months ago (he's 5 now, 6 in september). Our dogs killed a rabbit in our backyard, and he laughs about it. He mocks the rabbit, saying "(dog 1) and (dog 2) hurt rabbit. rabbit go Aaa! rabbit get hurt" and he laughs (we explained that the rabbit was VERY hurt, didn't change how he talked about it). And then there's today. We had to get rid of our dog because she was being violent with our other dogs. My mother and I were crying about it, because we'll miss the dog. D was mocking us. He kept saying "Mommy crying, mommy go ahaha" (like a mock-cry) And he also didn't care that our dog was leaving. He just said "(dog) leaving. (dog) gone, bye bye (dog)!". But I was mostly concerned over the way he reacted to our mom crying. I've never seen a child not care that their mother was upset. I've cried out of frustration while taking care of him (he'll be making a mess or screaming and stuff, and I cry easily so I start crying) and the most he'll say is "OP, don't cry" but he won't stop doing the things that was making me cry in the first place. I have never had a younger sibling, I don't know if all kids are like this. I dont remember behaving like this though, and my mom is concerned about it too. Is this normal, am I looking too deep into this?