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So. Meme requested Lestrade have daughters. Many, many daughters. And the author had been hunting for a kid!au prompt for the longest time.
"They all adore him and try to help him out since Mum died, like bringing lunch to him if he forgets XD But they are sad to see their Dad so lonely.
So they try to set their dad up with someone nice. That polite, posh man with the umbrella? He seems like a good fit... ;D"