Thank you for your range of responses - all read and considered.
This will be a slow process if we are to rebuild a relationship. We don't live nearby, nearly 4 hours away, so contact was always going to be more limited.
DS has been an a*se, ex DiL too - and her family haven't helped the situation, interfering, clingy. DS should never have married.
Ex DiL has her own issues too. DGD is the pawn. Ex DiL maintains she has to keep DGD away from her daddy, for DGD’s mental health. I'm not so sure, attachment/abandonment are pretty damaging.
We have had some contact, a visit out with Ex DiL and DGD, when we took them both to a children’s show at the theatre. It was just before lockdown. We always send presents and cards, we sometimes receive a message that they have arrived, sometimes I have to ask, sometimes we get a thank you, sometimes nothiing.
Ex DiL assumed that we would ‘take DS’s side’ - we haven't, we expect decent adult behaviour, who ever that adult is. We’ve kept out of the disagreements and have no information about the court case. A generalisation is DS has behaved badly, giving Ex DiL some events to dramatise. DS, it seems, is too scared of the effects, financially, on his job and on his new family to be able to fight much more. He should have behaved himself and then on Divircing put DGD first, establishing/ fighting for contact before having a child and marrying someone else. Talk about rushing in!
Ex DiL is in touch sometimes, then we are blocked at other times from SM, mobile access etc. No reasons given. We have only just been able to share with her that we have very limited contact with DS, something she had assumed otherwise.
Newly married she will be moving house. We are in her hands as to whether we will have a new address.
If we can pick up contact again, I'm really feel we need a commitment from Ex DiL so that DGD isn't repeatedly let down. It must be awful for her - ‘ I see my grandparents...then I don't’ . Even if it was minimal but agreed and consistently carried out, at least DGD would be secure in that.
More mulling, I'm afraid!