The only thing canon based (as long as you don't mind being spoiled) is that Eli and Kate show some small signs of having problems, which fueled my inspiration. :3

You know, I think I'm okay with this lol. Except for the part where they like always have problems but then work them out. Idk. I AM SORRY BUT TOMMY IS SO MUCH MORE INTERESTING TO ME OKAY? LET'S EXPLORE THIS BOY'S PSYCHE, I'M SURE IT'S DELICIOUSLY SCREWY. :DDD