While searching for a cockatiel to fill the space that Sweetie left, I found so many cockatiels in need of help that I ended up with a flock. Some were even handicapped by their humans. Phoenix had his wing chopped. Gimpy has a leg missing and Lacy has toes missing. That is just the physical abuse that they suffered. Most were terribly scared.
It is good that you posted in theparrotforum. You can even put them in
www.rescueme.com with all your info on them. In rescueme you can add a long list of likes and dislikes as well as telling about their personalities. I have only rehomed a few times since I don't let my cockatiels nest. It is very hard to find a home that will care for them more than you do. Take your time and interview. If you can visit their prospective homes to make sure the new humans will keep them together.
I am in Florida and don't like shipping birds so I am not an option. I have driven long distances to rescue a bird but California is a bit too much. I can only hope that another member of the forum will adopt them.
So sorry that you have to give them up.