Police fatally shot a man who viciously stabbed his disabled mother at their Long Island home on Mother’s Day, according to authorities and sources.

Southampton cops responded to an “escalating domestic situation” at a Riverhead residence on Topping Drive around 2:40 p.m. on Sunday, according to the Suffolk County Police Department.

Police fatally shot a man who allegedly stabbed his disabled mother at their Southampton home on Mother’s Day. ABC 7

The mother, who sustained several stab wounds in the harrowing attack, was rushed to a local hospital with serious injuries.…