70s or early 80s I think. Takes place in a coastal town in San Juan County. Has a scientist-father trying to hide the fact that his two blonde kids(one by and one girl) have psychic powers. There is a confrontation with a biker gang at their home and the father is attacked and {I think) killed. New deputy in town gets involved.
Help?
“Kiss Daddy Goodbye”?
That has some similarities to Escape to Witch Mountain. The story doesn’t match exactly, though.
Here’s a snip of it, in case you recognize the kids: Escape to Witch Mountain 1975 Preview - YouTube
It is not ETWM. This one is more of a cheap horror movie, with a bit of gratuitous partial nudity.
Then I think MissTake has it.
That’s it! I am watching it right now on the Roku channel American Horrors, and I just recognized Fabian playing the deputy.
I got one! 
Hope it’s as bad as I remember!
Delightfully so.
I found this snippet of the movie, and “bad” doesn’t begin to cover it. “Last night I saw a movie on TV??” WTF?
Well, the movie just ended…and by that I mean that it just ended abruptly in the middle of a scene where the Bobbsey Twins from Hell are being asked questions by the deputy. Either they ran out of ideas, or they ran out of budget, or both.
The Director’s Cut of ETWM, then?