My granddaughter (GD) lives with her mum but visits dad every other weekend. Recently, my ex son-in-law has given my granddaughter's bedroom to his 6 month old and she now doesn't have a bed or bedroom at daddy's. He is still insisting on having her but sends her to her other nannies for 2 nights and she sleeps on a camp bed in his bedroom with his new partner on the 3rd night. Until recently my ex son-in-law was estranged from his mum and she had regular contact through my daughter and myself. His mum has not told my daughter that she has my GD to sleep over on a regular basis and has cut contact with us all. My granddaughter doesn't want to go to her daddy's and wants to stay with her mummy. My daughter thinks she can't do anything about it. My view is that she should be with either her mum or her dad, and only when neither can look after my GD should they ask the grandparents to step in. She is only 4. My daughter wants dad to have contact with her daughter but he doesn't seem to want to spend much time with her, insists that he has her just to spite my daughter and then hands her over to someone else.
Advice?