We are currently expecting 18 for Thanksgiving, with an outside possibility of 23 including Betsy, David, Eric, Connie, Larry, Betty, Bill, Randy, Bruce, Vicki, Susan, Janie, Steve, Jim, Cindy, Thomas, Dianne & Betsy's other Sister.
That's 16 set, 2 possible, and the Nix family could make it 23!
UPDATE: According to Betsy, her other sisters name is "Polly"