Weddings .... can guarantee to bring out the best & worst in folks, whether it's the bride, groom, parents, bridal party or guests. Add in extra factors like second weddings, kids, family traditions, age .... it can get even worse.
I've read through ... so just some thoughts ~
- I have no issue with who they selected to be in the wedding and that you were not in the wedding. I think particularly with older people bringing older children in to the situation, it makes sense to have no what I call "token" attendants aka other's people. Have you own sisters, daughters, friends. I actually preferred when my DM got remarried later in age - NO attendants, they just aren't necessary. It sounds like your father selected your DH to represent your family because he is a male. He probably thought no deeper than that. If he truly didn't want you there or have you involved, he wouldn't have asked your DH. From your description of him it doesn't sound like he would feel pressed to do something he didn't want to do so he could have just left you all out.
- There is no reason for his wife to include you in dress shopping etc if you are not in the wedding. Just like I don't think brides have to bring their future MIL along to shop. Some do it because they would like to or have that relationship, but many or most probably do not. The fact that she was not willing to tell you a color stood out to me because honestly if she was just concerned about you picking a like color then she should have said "Periwinkle, so I would appreciate you pick (insert colors) for our family photos." It sounds like she was concerned you would pick the same color (rather than think it through).
- Could it be that she is the problem on how things have ended up in terms of wedding day? Sometimes there are people that try to do the right thing but don't have the "backbone" especially in situations like this to follow through. Do you think possibly your Dad mentioned her asking you, she refused, so he asked your DH? Do you think his response that you wouldn't be at Rehearsal Dinner if you DH wasn't in wedding was because SHE wouldn't have invited you? Do you think her refusing to tell you color was because he may have asked if you could be in the wedding? You say he didn't want to ask wife things .... or maybe he had and it hadn't gone well.
- I understand the stressed relationship at this point but going back to after your Mom passed ... in my mind if he really didn't care for you or wanted to be around you ... why would he show up so much for dinner at your house. I would think he would find excuses and quickly stop coming. You say he doesn't speak to other siblings ... I get they are from another marriage but obviously he has been in family long enough to have a relationship with them. Could it be your Dad is really really bad at expressing emotions, at being loving, at cultivating relationships? You can't judge just because he was and is getting married again, it could be a very superficial relationship or one where she went after him. Or maybe she is putting a wall up that "he is joining her family" and wants them put first. We've all seen that.
At this point I would put the wedding behind you, given all the parameters, I wouldn't be upset at all. What would upset me is the small hints that possibly the wife is behind all this and he didn't stand up for me. At that point I would put some distance between us, not expect anything from him. I would continue to send birthday and holiday cards, text and call on holidays and random times. If he doesn't answer leave a positive message. I would have my kids touch base and if my kids had any special activities I would put the invite out there. I would stay on the high road and whatever you get back .... that is now on him. Your focus needs to be on your family, your kids and your own self-esteem that it's not you, it's him.