My God, TQO, you have GORGEOUS boys! Wow! Your DS1 looks like such a fun little lad.
So sorry to read about the kita. I wonder what is going on there, it seems very strange. They just started talking about the "problems" all of a sudden, didn't they? I don't remember you posting about DS1 before the last couple of weeks.
You are doing the right thing, get him checked by your paediatrician (do you get on well with him?) and have a good chat with the kita.
Do they shout at your DS a lot? You mentioned that he told the Erzieherin to shut up when she shouted at him. In our kita, I never ever heard a member of staff shout at a child, and I spent a lot of time there. It was just never done. I know that in a certain situation (if a child did something dangerous) that it might happen, but not as a displine tool. They managed quite well just with a certain look and a quiet word.
Can I suggest that you try not to make comparisons with UK systems or UK children, I think that they might take this the wrong way. I have found that saying that "back home we do XYZ instead of ABC" is often taken as criticism, when sometimes I have just been pointing out a different method of doing things.
They need to explain where the urgency has come from, why they suddenly want your DS to move to a different kita. What they feel that the other kita could offer that they cannot (and why they cannot offer that).
How big is his group? Does he get on well with the other children?
It really would be better if they could persevere, another change would be hard for your DS. I don't know if it is good for him to be "punished" all the time, it must be demoralising for him. Could they do more in a positive direction, more praise and hugs when he is well behaved. That he is allowed to sit on the Erzieherin's knee at story time, or hold the book? Give him some important thing to do, that he really wants to do.
I taught English to wee ones, and the best thing to do with a distruptive child was, imo, to give them more positive attention, get them to help, give them Aufgaben.
Hope that your appt with the doc goes well tomorrow, and that he can give you some good advice.
Been to IKEA today, got some new lamps and bits and pieces. Cursed the new unit that I assembled today in the living room, bloody bastard IKEA doors, I was ready to throw them across the room.
My cure for homesickness: Read the posts on the NHS, knife crime, binge drinking, WAGS ...
and a cup of tea and a hobnob