Alright, time to start off with the royal family!
Chrom gets two wives because why not. He's married to both Sully and Cordelia. Lucina is their eldest daughter, while Kjelle and Severa are the younger twins. I know they have different birthdays but oh well.
Lissa and Maribelle are married, and they have Brady and Owain. They have agreed not to mention their surrogate father.
Moving on to the rest, Gaius married Sumia, and they had Cynthia. They're a very close-knit family unit who like to host their own little baking competitions sometimes, and their friends get to sample the results. Nobody ever really wins these 'bake-offs' though.
Henry and Olivia are married, and they have Inigo. There have been jokes about Inigo being akin to a Disney princess because he just... attracts wild animals.
Lon'qu and Panne married, and they had Yarne. While still learning about taguel culture alongside her son, Panne is also wanting to have more children, to help revive the taguel bloodline.
Gregor and Nowi married, and they had Nah. They're all kind of struggling to bond as a family due to what Nah has told them about her future, but her parents are determined to make up for that.
Libra and Tharja married, and together they had Noire. While Tharja was rather distant from her future daughter at first, Libra was quick to accept her as his own.
Frederick and Cherche are also happily married, and they have Gerome. Though Gerome has tried to act like he wants nothing to do with this "past family" of his, both of his parents can see right through him.
Virion and Miriel married and had Laurent. Laurent has picked up on both his mother's intelligence and his father's skill with words, making him the ample and typically-agreed-upon "leader" of the other future children, alongside Lucina.
Say'ri met a tactician known as Kraven, and the two had Morgan. Morgan is a master with the sword, and she always loves testing her skill against her friends, particularly Lucina and Owain.
Now for child unit relationships! None of them are currently married, but are together.
Lucina and Robin are in a relationship. Most everyone still believes Robin to be a young man, much to their entertainment. They're still a little afraid of Lucina's family though.
Owain and Cynthia were the first of the future kids to become official, and they continue to be known as the power couple of the army.
Inigo and Severa, despite how it may appear to some, are also content in their relationship. Inigo "likes the thrill of the chase" that Severa grants him, even if they're already together.
Yarne and Noire have developed a bond, though not quite official yet. They're both a bit too hesitant to put it out there.
Laurent and Kjelle are new to such a relationship, though they seem quite comfortable with one another.
Nah and Morgan are very close, but it's not really a proper romantic relationship, either. Maybe someday, though.
