I can answer that for you. It's never too late. Yes, if a couple is divorced they can come to a weekend if they are ready to try. It is not for couples that have never been married, although you could ask to be sure since it looks like you have a child together.
There is no suggested time limit. Sooner the better I would assume.
The Retrouvaille people will call before the weekend stating that there can be NO third party involved, and they will ask to make sure.
