Okay so, i can't draw them yet buuut i did have some ideas i wrote down:

Leith's kid:

Probably a girl Leith adopted from Playcare to show his "support" for the orphanage. But really, he doesn’t actually gaf about the kid LOLLL if he's gonna have her around, i think she'd have her kept at home to be taken care by nannies, but not care enough to know how she is unless it inconveniences him in any way.

The kid herself has mixed feelings about her dad: finding him arrogant, but wanting him to atleast notice her in any kind of way and be proud of her.

I'd imagine she would grow up to act similarly to Leith, in a way, and she'd still resent her dad for neglecting her. But she does want to inherit the company and in her own way, make it better than Leith could ever do. Petty act of revenge to feel better than him :3

Harley's kid:

Quinn Navidson /j (IT'S REEAALLY HARD TO PICTURE HIM AS A DAD, I GOT NO IDEAS.)

Eddie's kids:

Eddie's bio twin daughters. They're Eddie's little princesses and he spoils them rotten, but he isn’t an actual present father to them as he's preoccupied with work.

The two girls often bicker as they inherited their dad's short temper /hj. They would probably be like those spoiled girls who are supported financially but often crave their father's attention. They'd probably miss him a lot and know NOTHING about their own dad.

I also like to imagine he had an illegitimate son (from a past relationship) that he later adopted into his family, to his wife's displeasure, when the mother of that illegitimate child died. He'd treat the boy similarly to his daughters, where he gives him anything he wants but isn't present. The boy is probably not used to his new environment and is rather shy and meek, scared of his stepmom too.

As for the twin daughters, i don't think they would get along with him that much LOL but but, i can see them let their brother tag along only for playing games. They'd also think he's taking their father's attention from them, too.

Stella's kid:

Stella's bio son!! He's a lot more mature and wants to act grown up a lot, an opposite to Stella. He thinks his mom is a little childish and she prooobably acts more as his friend than his mom? And he would wish Stella wasn't so attached to her childhood as, to him, he thinks she should grow up.He still does care a lot for his mom though, even if he feels somewhat distant.

I could also see Stella adopting a kid from Playcare too... a little baby girl :) and her son would be a very protective big brother to his new sister.