Hi, thank you for your question. Is the motorbike registered in your son's name?
Did the police get involved with the assaults, if so what did they do?
Thanks for confirming. The legal position is that her father cannot keep the motorbike and must return it. The legal owner is your son and him withholding it will give your son grounds to take the matter to the local county court for the return of the motorbike. He should first write him a formal letter explaining that he is unlawfully withholding the motorbike and provide a reasonable time to return it to him, after which he can proceed to his local county court and submit form N1 and a £355 court fee to obtain a court order requiring him to return it.
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No worries, I hope it goes well. If you have any questions in the future you can ask for me directly by starting your question For Harris