This was a short novel from the 80s/90s (or possibly earlier). I never read the whole thing, but it starts out with an adult “normal” character drives his car to a remote house where multiple children and teenagers with mental powers (telekinesis, etc) live. As far as I can recall, there are no adults in the house.
The scene I clearly recall occurs shortly after the adult arrives at the house. After a brief tour of the house given by one of the female teenagers, he sits down with her and possibly other characters to have a discussion. They serve him coffee, and he ends up spilling it all over his lap. A young boy in the room uses his powers of telekinesis to lift up the particles of coffee from his clothing and it’s like the spill never happened.
Edit: It’s not More Than Human by Theodore Sturgeon. In the story I’m trying to ID, the main character who went to the house in which the children live was an adult, and had no special powers or status. I think they referred to their powers as “gifts” or “talents.”