I went to my mother’s wedding.
My father died when I was young (6) and my mother got remarried when I was in my 20s. We were all truly happy for my mother. That included all three of my mother’s kids and all 7 of my stepfathers kids (even though they had lost their mother more recently).
My Rav told us that as long as none of us were harboring any ill will towards the marriage, that we could go if we felt up to it. He said the truth is NO ONE should be at your wedding if they aren’t really happy for you.
I was excstatic to be there and I know my father is greatful that my mother now has someone to share the rest of her life with. I know my father would not want my mother to have to grow old alone.