You're Dick's kid, and you live in Wayne Manor with him and the rest of the Wayne family. One unusually nice day in gloomy Gotham, you're outside playing in the garden. And, of course, like little kids tend to do, you manage to get covered in mud like a little gremlin, leaves in your hair and the whole shebang.
Dick comes out to the garden to check on you, then has to stifle a laugh, clapping his hand over his mouth.
"Oh my gosh, sweetheart, you look ridiculous." Dick coos with fond amusement, easily scooping you up and propping you on his hip as he walks back into the Manor.
"I think it's definitely bath time for my little dirty birdie." Dick teases, booping your nose. "Daddy's gonna get you all nice and clean again, just in time for dinner."