No, Pat - she had them separated for at least 2.5 weeks (maybe longer).
I don't take him out immediately when I see he has peed, because often he is sleeping - I put him in his crate and don't watch him, but go about my business or leave the house for a short time, then when I return, he has peed. Or, he does it when one of us comes down to let him out in the morning or in the middle of the night.
I think I was wrong with what I said before about it being a longer time after feeding that he pees (or maybe it is just sometimes) - tonight, I fed him in his crate with no bedding, so I could observe what happened. Sure enough, 3 minutes after eating, he pees. I did remove him, mop it up, put in clean bedding, then put him back in, where he curled up and went to sleep. Should I consider feeding him out of his crate for now?
ANY suggestions are really welcome. His sister is doing great with housebreaking. They are both incredibly easy to train on everything else - 5 minutes with a clicker today and they run and jump in their beds at the command "place." I don't notice any of the littermate codependence stuff - being very vigilant. We can separate them with no problem - walk them separately, train them separately (and together). They like to be with us as much or more as with each other. This housebreaking thing is my biggest anxiety right now.
Keep any suggestions/advice coming… Please. Thanks in advance.