can the parents not use childcare/nursery for part of the week, what about other grandparents, are they able to help and as for not staying with dh, just go out, if she throws a tantrum, it won't last long and she will settle down and get used to being with dh. you need to speak to the parents, what would happen if you took ill, who would step in and take over, you are going to make yourself ill, this happened to one of my neighbours, she had her two 4 year old gd everyday during the summer holiday's and for two weeks full time when the parents went on holiday, she ended up taking ill with tiredness and depression.