Originally Posted by
MCESaint 
DS may (but doesn't have to) spend Saturday into Sunday overnight at grandparents (AW's parents - there the only grandparents still living).
It seems you put a lot of trust and faith into AW's parents. If AW is verboten from seeing his mother other than a Tuesday afternoon, won't she be able to see him at her parents' house and possibly take him from there? And is DS the one making the decision to have an overnight at the grandparents?
I think you've put a great deal of thought, and energy, into this.