I use a mod that prevents children from autonomous 'preside over royal court'.
(I like to play with families and with a lot of kids, no matter what their traits are - they just won't stop doing it, and it's annoying).
Regarding premades in general - I tend to play with them without changes (most of the time), but sometimes I do tweak their looks a little bit, and a trait or two if I think it's more suitable for the character and my story.
Examples - Iqbal Alvi's unibrow - I changed to two (still thick) brows. Boyd Wainwright is in Journalism career (as a blogger) instead of Science. I did change Connor Frio's trait from unflirty to family oriented once so I could have him married to one of my sims. Xander Clavell has a different voice in my game.
