I was sad to see a sign in Just Like Mother's window saying they're closed on Thanksgiving. Thought it would make a nice place for those away from their families.
For seniors, here's a nice alternative:
The Kidz Care Junior Civic Association of Forest Hills is planning a free turkey dinner for senior citizens in the area this Thanksgiving. The event will take place at the American Legion Hall, located on 107-15 Metropolitan Boulevard at noon on November 22
For Forest Hills non-seniors who are away from their families, here are some options where I've heard or experienced the waitstaff to be very friendly - which on Thanksgiving is probably your primary concern. Call ahead to make sure they're open.
Any other places that make you feel welcome? Quality of food not important in this one. . .