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I'm sorry to hear this and understand your concern for Roly, this sort of behaviour can cause a huge amount of stress for both owners and neighbours.
As the behaviour is only when your daughter is away, it sounds like he is experiencing separation anxiety, which may be exasperated by his grief.
There are several things we can do to try and help:
With something like this, especially if the neighbours are involved, it is never a bad idea to seek professional help and consult with a canine behaviourist to make a tailored programme for Roly.
Long term, we can also work on desensitization with a method such as this:
Under their 'What to do if your dog has separation anxiety' section.
How does this all sound?
I hope that this has been useful and please do let me know if there is anything else.