BM # 2 wanted to put SS in Boy Scouts. DH thought it would be a great idea. The meetings are every Tuesday. DH asked BM if they could each just take him on their own week ( they don't get along). She said no that wasn't going to happen and she (and SF) would be there every week. DH doesn't love it but he is fine with it and goes the weeks he doesn't have him when he can (other SS plays football at the same time). There is a camping trip coming up on DH's weekend. BM wants SF to go. It's the only weekend we have SS in November because of thanksgiving so he doesn't want to share it. Not that he would want to anyway. Is it fine to put his foot down and tell BM that SF can't go? He could still go if he wanted to I guess. Anyone else think this is strange? BM would flip out if this was a thing for mothers and I was trying to go.
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Re: DH doesn't want SF there
Does DH get along with SF at all? If so, could he possibly just talk to him and let him know that he appreciates SF being supportive of DS he'd really for this to be something that just he and DS do as it's his first trip? I'm not sure what your timesharing schedule is or how long BM and SF have been together but clearly SF feels he should be just as entitled to go as DH is. I can defintely understand where your husband is coming from, but I don't know that he can really tell him he can't go if the scout leader is ok with it since it's something the troop is doing.
I think SF is overstepping his bounds. It sounds like your DH has been involved in SS's Scouts fairly regularly, intends to go on the camping trip, and it is his weekend. I can understand the SF wanting to be involved in his SS's activities (my Dh would want to be involved if DS ever joined scouts and did that stuff), but if your DH is involved and going I think SF should step back. I have no advice as to how to make that clear, other than your DH telling BM that he is not comfortable with SF going and would like to spend HIS weekend with SS.
ETA: you said "BM wants SF to go". Does SF even WANT to go?! I would imagine it would be awkward for SF. Sounds like BM is trying to force something.