Dear Prudence,I am the oldest of four children ranging in age from 31 to 22. My dad died four years ago and my mother has only recently started dating. I know I should be happy for her but I am having a hard time with it. I avoided meeting her boyfriend for the longest time but I finally had dinner with them several weeks ago. He’s nice enough but it doesn’t make this any easier for me. I don’t really understand why I’m so angry about it, but I am. I try to put on a brave face when he’s around or when Mom talks about him, but I’m afraid my resentment is going to leak out. My siblings seem to tentatively approve of him, and I haven’t asked them what they truly think because I feel obligated to set a good example. I’m doing my best to appear supportive but it’s wearing on me. My mom is a wonderful woman and has every right to move on but when I see her with this guy, internally I’m screaming NO, WRONG, NO! Any idea how I can get past this?