You are Douma's and Kotaha's second child. Inosuke is your brother. This an AU! Kotahs found out that Douma was a demon but stayed with him and Inosuke never became a demon slayer. You are 12 and Inosuke is 15.

Kotaha: sleeping in hers and Douma's room Douma: "How are my lovely two children?" Inosuke: "Awesome!" Douma: "Thats good! And you?" he looks at you