Yes, just yes
I just want madness for the Batpham. Like picture Danny just being a friend of one of the Bats (Tim, Damien, Jason, etc.) and being invited to their house. When he's invited to his house, he was just in time for a meal. And it was a full house, so Danny was able to meet all of the family and was surprised by the amount of black haired and blue eyed people at the table. Dinner goes on and Bruce is the last one to join the family for dinner. (Whether it was because of Bat business or Wayne business is unseen.)
So he sits down and enjoys dinner with his family, talking to everyone and asking how all of their days were.
It wasn't until a few minutes after that he notices an extra head at the table and, seeing as Danny fits the description of his robins, just panics that he might of forgotten about a child. EXTRA: The robins going along with it and gaslighting Bruce into thinking Danny was their brother and Bruce had forgotten about him.