My mother and my DCs do have a nice relationship when they see eachother and she is a loving grandmother. We don't see as much of her recently as she works a fair bit and life gets in the way. She used to drop in and see DCs at ours but this seems to have fizzled out.
She has a painful condition (don't want to specify for fear of indentifying myself) and as a result is on a few medications including using regular morphine patches which affect her sleep patterns. When we visited her last time she kept nodding off while the DCs were playing/being quite loud. She actually had an accident about 6 months ago where she knocked into a bollard and admits she thinks she dozed off.
Recently she seems to want to take eldest DS out for daytrips, I do want to enable their relationship and DS enjoys himself when she is around but I am really worried about her being alone incase something would happen. I have tried avoiding her questions by saying we'd love to see you shall we meet there etc. but don't know how else I can broach this subject as I know she will get hurt and upset if I explain my reasons and take it as me saying I don't think she is a good grandparent.