@CanICelebrate
To answer your question, I don’t think there is any way of saying that without sounding like a cow.
Unfortunately I agree with this. In the 5 years from when my first DC was born, to when I left my EXDP, my 2 DC had zero days out with me and DP together as a family on non-DSS contact days.
Anytime we were going to go out, DP had to ring his EXDW to see if DSS could come too, same as yours. My DC couldn't even be taken for a haircut, and we weren't able to have takeaways initially, lest DSS might feel we'd left him out. Bearing in mind we were on an EOW schedule, meaning just 4 days in a month that we could do activities as a family. It was really frustrating as it felt like someone I couldn't see was controlling whether I could go out with my own family for the day. The reality was that it was EXDP's NRP guilt clouding our every move.
If we were doing big days out, like going to the theatre or a theme park or similar, it was me who would organise and pay for the whole lot, as well as me actively checking to see if DSS would be able to attend beforehand and arranging tickets for him too, so it wasn't as if I was actively trying to exclude him.
Never mind that while DSS was with his DM she was taking him to McDonalds, Pizza Express, toy shopping etc etc, this was all fine according to EXDP. If ever suggested a takeaway, I'd get "oh poor X will be missing out, let's wait until he is here"
In the last year or so of the relationship, I would place orders myself and say to DP "let me know if you want anything" (he always did), rather than asking him beforehand.
I took a stand when my then 4 year old DS told me we couldn't go to the park when offered one day as we had to wait for DSS. This meant I ended up taking the DC out places by myself, which while it's nice, wasn't the family days I'd wanted. I felt like I was behaving as if I was a single mum, which I shouldn't have had to, given I wasn't one at the time (although I am now). I'd end up dragging one of my parents out with the DC if I really wanted company, but it's not the same as going with your DC's father.
There was a thread earlier this year about how resident DC lose out in a number of situations compared to non-resident DC. Yes resident DC have their parents living together, but if they're treated as second class citizens in their own home by their father, their sense of self-esteem will be shot to pieces. I could see this starting to happen to my DC, and I didn't like it one bit.
You have my sympathies OP, if your DH thought there was anything wrong with making arrangements like this, he wouldn't be doing it...