Threatening and mental harrasment

My uncle is a schizophrenia patient , currently on treatment and medication. He is usually very quiet and friendly except for this repeated encounter with a neighbour who tries to trigger him by threatening him and abusing him. So far it has happened on three occasions when the neighbour incited him and they had a violent scuffle within this year. He has no issues with any other neighbours except this one man who constantly tries to stir up things. Today it went to the extent where this neighbour threw a large piece of stone at my uncle and ran away and then later on at night came back and start abusing us loudly on the streets in front of our gate. He tries to play victim everytime by showing others that my mentally unstable uncle is harrassing and torturing him . The neighbour is an illiterate , unemployed 34 /35 years old guy . Previously my family had amicably solved the issues by talking to his parents but this time they all have teamed up and gave us a threatening. This has caused serious stress and frustration for my family . We have recorded videos and audios of the incident and his abuse. What should be the next step?