DS just went round to his granny's (my MIL with whom I am low-contact) to offer to drive her to her sister's tomorrow. She was claiming illness and would have ended up being on her own tomorrow. DS drove round, sat with her and listened to her woes. Turns out she was nervous about the drive, so he sat in the car with her while she drove to ours. He made her a cuppa and I managed to be civil to her (I was in PJs, drinking gin and watching tv
) Then she drove home, fully confident once again , and full of praise for DS.
Parenting win! So proud 
(NB DH is at work abroad, or he would have done this himself. DS is brilliant about taking on this new adulting role - he's nearly 18)