A few of my guinea hens would sometimes start laying eggs again when their keets were only a month or two old. Usually the keets would all pile in the nesting box with mom while she layed her eggs. It was comical to see..they would all be crammed in there with her with some sitting on her back, completely oblivious to the fact that she may like a little privacy to do her business. Once she stated laying on the eggs full time, most of the keets would lay just outside of the nesting area a lot of the time, but would sometimes venture outside to free range with dad/male who helped raise/teach them. My guess is that that your older keets will continue to stick close to where mom is but may go hang out with dad some if he ventures away from her for a bit while she is broody and sitting on the new batch of eggs. They may seem a little lost for awhile without mom wandering about with them, but will eventually mature and get brave enough to leave her side.
