Just a preface: I don't feel depressed, I love life, blah blah blah.
I wonder if I would cry if my mother, father, or sister died sometimes. My grandfather died recently, and there was very little emotion - only, after a week or so, a kind of fondness and appreciation of a life well lived. And when my mother got cancer, I didn't even consider crying...I had almost accepted, with resignation, that she'd be dead in five years, and moved on. (She ended up beating it, which was a happy surprise given the original diagnosis.)
This might be some kind of defect. I don't know. I do feel emotions, but expressing them is something I'm pretty uncomfortable with.