not to make a ceremony gloomy?

We went to a small wedding ceremony of my sibling, no one noticed that we were not taking a portrait photo of my late mother with us. It happened naturally, I thought it would be a good thing for us as it's hard to stare at death all the time. But still I have some regret that I didn't take her with me. When my father came home looking at the alter, he realized that and cried a little. I could not find a word. If we would have attended with her, we couldn't help crying during the happy occasion. Should have brought or not? I have no idea.