There is a move from the 80's about a (royal?) alien family who crash landed their space craft out in rural or maybe farm land area; they are being chased by a killer. They crash near a family that ends up helping them.
I think the family was a father and mother, daughter, and grand parents. The family is humanoid, or more human looking--not little green creatures. The family has a body guard that is in an all black armored suit, I think I remember it had maybe a tail, and shot a laser gun.
The killer kills the bodyguard, stabs or shoots it, and I think I remember that instead of blood, it was similar to a light color (white) silly string that shoots out of the wound.