Im sure it has been brought up, but I dont think any evidence on this topic actually exists at the moment...
So there has been some speculation regarding the protagonist's significant other and the possibility that he or she may have a large role to play in FO4. I know Bethesda announced you emerge from Vault 111 as the "lone survivor," but I think there might be a caveat to that statement.
After watching a Gamescon recap below, you can clearly see at 1:11-1:12 the player character is not just wearing a wedding ring, but its actually equippable. Its possible that this means part of the main storyline could lead your character to be looking for significant others, or family members. The fact that you can choose to keep wearing or remove the ring is pretty suspicious, in my opinion. It just seems too irrational for Bethesda to put an equippable wedding ring in your inventory for it not to mean anything.
https://youtu.be/S1CqFq63pFo?t=72