I would definately get your son to find out lefally his rights as to what /where he can take his daughter on his time and if he can’t he should get a child arrangement order which he can get without a solicitor. I’m sure she can’t stop her being taken places with her dad like he can’t stop the mum taking her somewhere when she’s with her. Get advice
Can You Name 5 More Songs? (number 2)
Lack of public toilets in towns.