transfer of business from father to son in gst

vishnu kumar (7 Points)

11 September 2019  
my father has a properitorship business for last 30 years. He met with an accident last year and lost his memory and is in complete bed rest. I am running business on his behalf. Now he is not able to sign properly. How can his gst number can be transfer to his son(myself)?
what will happen to stock ,and input ?
Please let me know process for transfer in GST . Thanks a lot in advance.