Please help we don't know what to do

So in early spring we bought 20 something chickens and now we're down to 3, 2 roosters and a hen. About 2 wks ago 1 of the roosters started to walk around with his wing spread out. Figured he was hot, as we live in TN. But the next day he could barely walk, he seemed lethargic and his butt was wet. So, we bathed him, put athlete foot cream on his butt, gave him plain yogurt and brought him inside. After about a week he seemed better, not perfected but better. We put him in quarantine far from the other chickens outside. A few days later the ladies got in his area. But to do so they ended up flipping a board on him and we brought him in to fix both areas and put him back out. Now he's walking upright like the upright ducks, but needs to flap wings to get around. Now the other rooster started acting the same way. I'm not really sure what's going on or what to do. Please help. Our family is heart broken. I just don't want to lose anymore. By the way the Adults seem very healthy and unaffected.

 

legs do seem weak. And all the symptoms I posted above. "barely walk, he seemed lethargic and his butt was wet, holding wings out".