Super I find that dh is very hard on ds2 maybe subconsciously he's trying to make up for not being hard enough on his own ds who's now 21, almost trying to right the wrongs that were made with him if that makes sense.
Luckily he was 15 when dd came along so there was never a case of she gets x and why don't i with them.
Your ds is probably feeling like his dad had them first perhaps
Em sticking to your list, how does one do that? Can you be trained in this specific skill?
Pointless good luck with ttc too 