Her Babies Aren't Even A Month Old And She's Gone Broody Again!(Button Quail)

[JaeG]

Our little Spicey would sit with her big sister on the nest too. It was so cute. I've got a photo somewhere of them sitting together. She was actually the reason her babies survived as, on her own the older sister was a useless mother.

 

[DK newbie]

I agree with JaeG. In two weeks when new chicks might hatch, the older ones should be completely independent, so there would be no problem removing them.
If they are fed game bird feed and not seeds, they actually should be fine without additional heat indoors already at 4 weeks. If they are fed seeds, they grow and feather out a lot slower so in that case they should stay with their parents a bit longer.
8 weeks with the parents can be a bit too much in my experience - I had a clutch of around 6 males and one female last year, which I left with the parents till they were 8-9 weeks old and the boys were actually pecking their dad at this point.
I usually remove the chicks at 6 weeks, as I'm having trouble telling the females from their mother if I leave them any longer. They are also way past being able to sit under their parents at this point.
I've had small clutches (1-2 chicks) which I've left in an aviary with their parents when the next clutch hatches and this has worked out fine. I've always removed the big chicks in smaller cages though.
I had a hen last year who seemed to sit every time she had 7 eggs - hatch chicks, start laying again, 7 egg = start sitting. That was pretty much the same as what you are experiencing - she had 7 eggs when the old chicks were about 4 weeks old. The big chicks were fine without her and she went back to her nest once I removed them.