Amanda's husband WAS named Daniel, but his identity as Daniel SUMMERS was fanmade and not stated it comics. It DOES make sense it was him, given what both Amanda and Daniel Summers are connected to Sinister and it would make sense for him to organize their marriage and track down Daniel's bloodline for generations to come. But it wasn't confirmed. Amanda had a profile in some handbook, and this situation was explained there.
Hopefully, someone good with characters and continuity like Gillen, Eiwing or her original creator Nicieza would confirm this in book. I actually hoped Nicieza would do it in the issue of X-Men Legends where Amanda recently appeared. Unfortunately it was not addressed. Would be fun to see Summers' interaction with Amanda.
Also, IIRC it was hinted/rumored what Amanda was Gambit's biological mother. Would be fun if true. It would make him sort-of Summers, without being a third/fourth/fifth brother.
Personally, these kind of crazy relationships are the part of comics I love the most, they are just so much fun. Also love alternate reality characters who are kids of established characters who actually don't have any relationships in Earth-616. Like Nocturne, daughter of Nightcrawler and Scarlet Witch.