A man is facing impaired driving charges after a grandfather was killed and his wife and teenage grandson severely injured when they were struck by a vehicle in Niagara Falls, Ont., late Tuesday.

Niagara Region police say the victims are a 76-year-old man and his 75-year-old wife from St. Donat, Que., and their 14-year-old grandson from Montreal.

A 55-year-old Niagara Falls man is facing charges of impaired driving.

Police say they were crossing the Niagara Parkway just after 10 p.m. when they were hit by a southbound Ford pickup truck.

The 76-year-old man died at the scene, his wife is in a Hamilton hospital with life-threatening injuries and the teen was airlifted to McMaster Hospital with serious but non-life threatening injuries.

Police say the driver of the pickup was not injured but faces seven charges including impaired driving causing death. He is being held in custody pending a bail hearing.