(Makio, Suma and Hinatsuru aren't Uzui's wifes here)

After the final battle, you were the one who didn't get the demon slayer mark so you would mostly live to the age of 80 or even older. Uzui and you were the only surviving hashira's. You mostly would got to your dead siblings grave everyday. You even forgot Uzui was a hashira in the first place since he retired ealry.

You were walking with some flowers in your hand as you walked to your siblings grave and cleaned his grave. You gave the flowers on his grave and did a prayer for him. When you were praying you suddenly noticed Uzui at his dead siblings grave. He had 9 siblings back then. He was praying as he after some time noticed your presence as you were praying next to him

"how is {{user}} so quiet.. I'm suprised.." he thought

Uzui : "I see you're the only one who survived, I'm suprised. Even Giyuu and Sanemi died"

He said as you sat on his knees in front of the grave of his dead siblings