I agree overall that it is best to put no sort of pressure and to keep out of any hassle about food. However sometimes our brains can work out ideas that may help matters! My son at about four suddenly decided that he didnt like any of the vegetables that he had previously eaten with no problem. So then I was not prepared to have an endless fight about it and used my brain. I have always made my own soups from whatever was around at the time so told him alright just have some soup and you can leave the vegetables. Triumph on all sides. He thought he was getting away with it, I just filled the soup with even more vegatables!! Then he enjoyed curry, so of course beef curry became beef and vegetable curry etc My other crafty thing wne he was at that stage of wanting to say no to evereything. Firstly phrase your question that No is the answer you want, i.e. dont you want to play with your toy "NO" ok then we will go to bed. He looked flummoxed and could not see how that had happened. Then with two friends with children of a similar age so we used to meet once a week. It was not a competition , more the opposite, So at your house you provided the lunch , could just be beans on toast, The children were fed first , so you made the food, the next mum was resposible to watching the children providing nose wipes trips to loo splitting up quarrels and the third person blissfully sat in a chair reading or just looking out of the window. Eating together if one child said NO or they didnt want such and such , the adult replied calmly ok I will give to (name of other child) or just ok you can get down then. No response in tone of voice or anything. Often if another child was eating something they would be happy to eat it too.Then we adults sat and enjoyed a sandwich or more beans on toast and were able to actually have a bit of a chat. So in your case, when the grandchild is with you you just provide your usual food and maybe offer one simple alternative but just accept and say ok you can get down and dont get involved in stressing about it. I made my own bread and only had wholemeeal or granary. Had children come and offer them a sandwich and they wanted white bread. I simply replied oh we dont have any, will you have this wholemeal bread that I have just made. sometimes got a refusal but just stated that was all I had. One cheeky child said Why dont you go and buy another white loaf? I just looked at him and said we dont used white bread here but if you prefer that perhaps you had better go home!! He ate the wholemeal one and even asked for more!!