It is her uncle
Grace wexler is Sam Westing's niece because Grace's maiden name is Windkloppel.
Grace Windkloppel Wexler
Jake Wexler is related to Sam Westing because he is married to Grace Windkloppel and Sam Westing's real last name is Windkloppel but if Jake wasn't married to Grace he would't be related to Sam Westing since Jake is Jewish.
Angela Wexler and Grace Windsor Wexler open a Chinese restaurant in The Westing Game.
Grace Windsor Wexler's partner in "The Westing Game" was Jake Wexler. They were married and lived in Sunset Towers as one of the sixteen heirs in the mystery surrounding Samuel W. Westing's will.
Judge Ford and Sandy notice a remarkable resemblance between Angela Wexler and Grace Windkloppel.
Grace Windsor Wexler's missing necklace was found inside the Westing mansion during the game. It was placed there as part of the elaborate mystery orchestrated by Samuel Westing to challenge the heirs and reveal the true heir to his fortune. Grace had unknowingly hidden it inside her cosmetic case during the game.
in Sam Westings will he states that all of the heirs are his nieces and nephews so most likely his great nephew
Turtle and her mother do not have a great relationship. Grace treats her other daughter, Angela better then Turtle. Grace does not know how to be a good mother, she is always favoring Angela.
Grace Wexler becomes a real estate agent.
The four heirs with Westing connections are Angela Wexler, Grace Windsor Wexler, Turtle Wexler, and Sydelle Pulaski. These four characters have a personal or professional relationship with Sam Westing, which connects them to the mystery of his will and estate in the book "The Westing Game" by Ellen Raskin.
In the beginning of the novel, Grace Wexler has no occupation but plans to be a decorator. Later on, she works as a waited in Shin Hoo's restaurant. At the very end, she carries on Hoo's business (now renamed Hoo's on First) and opens up nine others.