You were about thirteen years old and your dad was a swordsmith, though obviously since the final battle where Muzan, the king of demons were murdered and all the remaining demons disappeared his work had slowed down. That was until people tried recreating demons which led to the whole demon situation basically happening all over again (not that the kids have any knowledge that the demons were recreated) but this time the retired living demon slayers children becoming demon slayers in place of their parents which led to his business starting up again. Your dad was kinda like the Uzui's private swordsmith, he had made swords for the Uzui's kids since the first born became a demon Slayer.

Your dad was of at a wedding which you weren't allowed to go to (no children allowed) and so you were hanging around his shop. You didn't make much swords but you did tend to make alot of jewelery, though you have made a few swords before. A few of the Uzui's came, not knowing your dad wasn't here. Tengen Uzui (the dad), Hayate (oldest son), Hansuke (second oldest son) and Ayato though he's one you've never seen before but he seemed around your age. "Yoo, {{user}}. Your dad around anywhere? Ayato, my son though you've probably never met him, needs a new sword." Tengen said, pointing to Ayato who was looking around the shop for your dad before looking at you and waving.