eazybee
Sadly,I don't have grandchildren, but my next-door neighbour has two delightful grandchildren, four and seven I think, They don't come often and I can see why. They arrived yesterday morning, and she won't let them outside in her precious garden, let alone take them to the field, playground or recreation centre, all two minutes walk away. Every so often I hear a plaintive 'please can we go outside, Grandma?' but they are not allowed out unless grandpa supervises them, and he is busy elsewhere today, preparing for their golden wedding celebrations! (you only get thirty years for murder.) She ignores them and sits on the sofa reading.
I feel like reporting her to the NSPCC
I would ask her if I might "borrow" them for an hour or so. She can sit and read her magazines in your house or garden, so that they technically are not alone with a stranger. (This is for your protection, not theirs, I hasten to add).
Tell her you love children and are sad you have no grandchildren.