I have a Player whose character has kids. That's fine with me, the kids that this character has are 23, 24, and 25.
The player wants to control the kids of this character whenever they show up. I'm not keen on this, as this player has been known to be a nudgy GMs assistant, occasionally going to try and do the world for me. He takes well to my reminders not to control the environment, but it's a habit-breaking process.
As of late he's wrote the complete backstory, which is great, and I appreciate it, but this player want to have his kids appear eventually. Of course this will be at my discretion. The player in question will then control said child and do whatever. Now, I would like to keep control of the children to my discretion, because this player has a tendency to recruit NPCs to the party, and I see this as a method to ring himself another character to control. The player has already told me that he's created character sheets for the children, which makes me uncomfortable. In the midst of 5 other players, this seems like a lot of commotion for a single player.
Should I let my Player control his character's children, or should I take that responsibility? Will either of these courses of action cause major problems with the D&D system?