I can see both sides, but for the sake of the children I think your son should continue to visit his children, but see them in their mother's house. For the sake of the children she should allow him in to the house to spend some time with them; these are exceptional times and both must make adjustments. He can't take them out anywhere. She could go out for exercise or do shopping even if the time is reduced.
If she refuses, he needs to make the offer in writing, as she is threatening non-contact, and he may have to prove he wished to maintain contact.
My daughter's partner and his ex-wife have worked out flexible arrangements, even though it was an acrimonious split; both are agreed the children come first, no matter what.
Gary Glitter programme Tuesday
4 Years On…..Health-wise, Has Anything Changed?
Being quizzed by chemist's assistant in Boots.