[Lusciousblondefemme]

Andrew,
I would tell your neice that since it is her big day that she should do what is in her heart. If she feels that she wants to honor her aunt than so be it. You should also ask them When exactly they think that its enough time or the right time for her husband to move on. Unfortunately everyone deals with heartache differently and no one can tell another person when its time to move on. Tell them that its not that he is trying to replace their Aunt, it's just that he wants to feel happiness again.
I hope that her wedding is amazing and that the day goes off without a hitch... There truly is something to be said about your neice who wants to honor her aunt. That is something very special she has inside of her heart.