SS14, SS13 these two you should be able to talk to realatively easily.
"I need you guys to just enjoy mom being around and not ask her to come home. Sometimes people do funny things when they feel pressure, sometimes they do the opposite of what you want because of it."
S8, D6 Say something similiar I suppose, but it is going to be harder for them to grasp the concept.
Ulitmately?
I really do no think it is a bad idea that your children let her know they miss her and the family being together.
This is the consequence of her actions. You? You can handle it, got all your crap in one sock, the kids? Doing well but miss mom.
Let her know that you're not the one putting pressure on her, the kids do miss her, and it is a natural thing for them to want her around.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK