Well, there is always a chance of rejection. It can happen for no reason at all at any time.
You do have both parents, so even if the hen stopped feeding, your male can rear the chicks on his own.
Are your adult birds "tame"? Are they comfortable around you?
If they are comfortable around you (don't scramble or fly to get away from you) they should be fine if you have the chicks for a few minutes. You can put a sprig of millet in the cage to occupy them while you do that. Or some paper type toys to shred, or both.
My male was "tame" so I would have him with me and the chicks while I held them he would feed them. Later when I took over hand feeding, I would always invite him to join us, sometimes he would help, other times he just sat with the little ones while I fed.
Your chicks are at an age where even if they got rejected by their parents, they are a nice age for hand rearing. The problem is if you're not there to do it. I would go through it with your partner, show him how to prep formula and feed using a small teaspoon. It is super easy and low risk using a spoon. It is messy though so you gotta tell him to clean the babies after the feeds. But then he would be able to step in and do any feeds you can't. Knowing how to prep formula is handy to know even when there are no babies, so older birds or birds that get into accidents need to be fed that same way.
Here is a good video, super simple and clearly explained;
Just be sure to tell your partner to use a
spoon to feed, not a syringe or needle.
With these Links-I hope to bring You as Much information as I can to help anyone that finds them selves having to Hand feed A chick Lots of tips for Breeders-with links for Hand feeding etc http://www.parrotscanada.com/breeder...rbreeders.html A new way to Hand feed-With a Cup...
forums.avianavenue.com
I have never taken the chicks out of the room from the parents. I don't think it is a good idea. You are better just giving them something to distract - treats, veggies, bathing bowl of water, shreddables etc, and you sitting nearby with the little ones for a few minutes.
In a couple of weeks (when their feathers have come through) you will be able to offer some millet to the chicks, and interact with them that way too. So buy a good sized bag of millet sprays!