Sometimes, the spouse notation doesn't keep when uploaded. I've discovered this the hard way. Had thing set initially, then had to restart my game for various unfortunate mishaps. Only to open a new save and download the same family. Discovering after the fact that they weren't married! It's really odd to have the couple being newlyweds (should you take car of it in game) when their firstborn is close to being a YA. Face/palm. Rule of thumb I try to live by: While in CAS when downloading a family, check the relationship panel for the parents to make certain they still show up as husband or wife. Can save a lot of grief in the long run.
Best of luck! And Happy Simming!