@trying2learn,
I really don't have any time for this. I'm not bothered about how you feel about my loss. I've dealt with it, I don't go on about it. Unless you're clinically depressed it really is that simple. Moping and moaning as much as you are, this long after the event is not normal. You may be clinically depressed, make an appointment with a doctor, get yourself diagnosed properly. A lot of people suffer from depression, it's nothing to be ashamed of. You need to see a doctor, if only to rule this out.
If you're not clinically depressed, you need to suck it up right now. Find something positive you can do to help others. Are there any issues, situations your dad/sister cared deeply about? If not, what killed them, cancer, stroke, diabetes, what? There's something you can put your effort into, a charity you can raise funds for that will do your loved ones proud. Focus on that, it's a lot better than feeling sorry for yourself.