Late 70’s early 80’s- Kids get stay at granparents house and get kidnapped by neighbor

Saw it on television mid 80’s. Color, in english.

These kids(boy and girl) go to visit the granparents possibly another family member.

There was a resaca or large creak separating the houses in the back yard. Across was a white house with an old man. The kids see some things that concern them though i cant remember what.

They end up getting kidnapped by the man and are stuck underground.

The escape scene was them sliding is some tubes like you see in a water park.  White tube.

I want to say there was aliens but i am not sure.

 

 

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