Your question on what to tell them. Tell them the truth. He's a No show and you don't know why he does this. Don't sugar coat it for them. My D's have cell phones and when my W upset them they let her know it. It didn't come from me.
The relationship your H has with his kids is his own. Don't make excuses for him either.
It's important your kids have the choice. I never once said a bad comment about my W to the D's. They came to their own conclusion.
Let your son call him and ask where are you dad? Has he ever called him before BD. Don't coach your S either. Your son knows what to say. Your H will probably think you told your S to say certain things. Your H can think what he wants. It's on him.
I feel your pain so much because I went through this in the beginning. The crying from the D's. It nearly killed me. W would do something mean or say something hurtfull. I'd go back to the house because the D's texted me saying help. I'd look at my W and ask her what does she think she is doing... I get a cold look and she'd say I was controlling the D's.
Your H like my W have to deal with it. Her loss, she's missed so much. Like your H. The day to day things and laughs.
I really don't know how they do it. I cant understand it. But then again I'm not crazy.
Hugs Irish
M51 XW43 (38 at bd) BD1 MAY 30 2015 BD2 JUNE 25 2015 by text moved out Aug 2 2015 left both Daughters 13 and 15 (now 18-20) Her divorce Final July 26 2016 Last time she saw her kids Aug 2 2015