This is based off another one of the chapters I have in the story
that involved Solomon Grundy being found and taken in by Jervis Tech and by extension though a little bit reluctantly by Jonathan as well

I stewed upon it and came up with the idea the jervis has a knack for adopting strange creatures as his children, even if they have the mental capacity of adults they're his children now there's no argument you can make to sway him off the path of monster Parenthood

here's some examples

btas

it on a crisp October morning when Jervis comes home with both the groceries and an extra item

a child with an air about him like he's older than he should be

" jervis" Jonathan pauses to take a deep breath before continuing, " who's child is that"

the blonde hums in thought but the question is answered by the child himself

"I am no one's child, I was born not from flesh and womb, but from Darkness at Magics so foul", he says it as a statement of fact, for some reason Jonathan has the instinct to believe him

" well now he's our child, I found him and we're keeping him" jervis States his tone very evident of his determination that yes this is their child now and no nothing Jonathan says we'll sway him from this decision

and despite everything inside of him screaming for him to cast this most likely devil child out of their abode, he just sits down back in his chair and decides might as well be a dad

the Batman 2004

Dave was designed to be many things, the ultimate villain, the ultimate test for the Batman, and now a new thing, to be a son

Dave did not know of his new purpose when he first woke up from non-existence, he does not know the two people standing before him, his first instinct is to move, first he tries with his hand

nothing, then he tries with his legs

nothing

he tries looking around the room, that attempt at movement to successful

the horror of the situation only has a few seconds to Dawn upon him when one of his more fleshy companions grab the glorified paperweight his Consciousness has been relegated to

the red-headed creature of flesh put some in front of a mirror and he finds that he is physically greatly changed, the Motionless form he dwells in is not one he remembers ever inhabiting, it resembles the head of a man, though clearly made of synthetic material, the hair is too perfect, the skin unblemished, the teeth when he opens his newly acquired mouth are straight and white as Pearl

"who are you people" he says after a moment of consideration

"we're your recreators" the redheads says in a chipper tone

"why don't I have a body"

" because we know the first instinct you have if you did would be to attack us" the brunette says suddenly standing next to the redhead in David's sight from his Vantage looking upon the mirror

" will give you a body, but first we need to talk about an arrangement I think you'd like"

...

He does like the arrangement, In exchange for playing house with these flash bags he gets to help them with any crimes they commit

it's a win-win situation, they get to have a son, and he gets to do the thing he was created to do, crime

also sometimes they sneak into Arkham Asylum and he gets to punch his original Creator and his stupid balding face