Yes I tend to agree with everything you said. When coordinating, I did it with S15 and later mentioned to STBX who of course didn't complain, it was exactly what he wanted.
I explained to S15 that I was not in any way trying to say anything bad about his father, he just needs to know that the rules apply to anyone who has been drinking and he shouldn't get in the car with them (father or not). He understood without me saying much thankfully
When he left Sun am he texted me to say "S15 is sleeping, I didn't make him breakfast. I am leaving now"
It makes me sad, not only is he giving up his time with the boys for drinking/dating/whatever he is up to, but he is also trying to be their friend when he is with them. Great, just what I need
Yesterday as we were leaving baseball he mentioned S17 coming to his house at midnight Tuesday (tonight) Tomorrow is his bday and he will be 18. He wants to smoke a cigar at midnight. I explained that he has no days left and needs to get to school. If he is out until early morning hours it will be me who has to get him up and out for school. And I think graduating is a little more important than smoking a cigar at midnight. Especially when STBX will see him on Wednesday anyway.