When me and my friend both got married, our wife was stuck at the same place, the place where Leah was doing her wood sculpture and Abigail was flowing her flute, both me and my friend can't talk or give gift to them either. I don't think this is a bug because there are program to do there thing at that spot P/s: I don't have picture because the when i used print screen, the picture got white and i didn't know why. P/s 2: I suggest the dev team should make them(all character able to date) to do those thing at different location so they don't look like they stuck to each other.
the same happens with Alex and Leah in my multiplayer playthrough. I think this is still the undeveloped part of the multiplayer; and I believe it will be fixed once the major bugs are done. for now, I can, at least, get a good laugh out of it; it's amusing seeing Leah smacking Alex with her hammer