A free mod for Stardew Valley, by aedenthorn.
This mod is a combination of the various things that I have tried over the years for a similar purpose. I have always felt like there should be a way to allow multiple spouse + child combinations, but never found a way to do it properly. So I decided to make my own version of it.
This mod adds a new option to the game. When you create a character, you can now specify the number of romantic relationships like spouses or roommates with spouses.
It is possible to add as many different spouses as you want. You can even add more than one spouse to a single character.