Hello, could you guys please help me to identify certain horror movie I watched several years ago?

This is the plot:

A family conformed by a Dad, Mom, teenager daughter and Son is going on their car through a road, when their wheel pops up because someone put spikes on the road, so the family gets out the car and sees a near house that is filled with old cars and car parts... the lady that owns the house is very kind and tells them shes gonna help them to fix their car, and then invites the family to eat dinner with them. At the dinner table, the Mom starts to take pictures with a camera with flash, and wants to take a picture of the grandfather who is sitting behind a curtain. The flash of the camera makes the grandfather get mad, and he reveals himself as a monster? (he was wearing an outfit similar to the monster from jeepers creepers, and a fake beard pretending to be a grandpa)... the monster kills the Dad and the Mom, while the son and daughters scapes, leaving the house and running to the woods. The monster chases them and throws some kind of ninja device and slipts the son in half, vertically. And then he captures the daughter.