Hi Rich, In 1920 Grace Laubenstein was living in Spokane, Spokane Co., WA with her family. Edgar Laubenstein, b. PA, 52, chef cafe. Catherine, wife, b. MN, 45. Grace, b. MT. 19, single. Maxine, b. WA, 9.
In 1930 Grace was still living in Spokane. Katherine A. Laubenstine, head household, b. MN, 57, widow, 1st Marr @ age 23. Grace C., b. MT, 26, single, clerk dry goods. Maxine A., b. WA, single, stenographer book store.
I don't think this Grace was married to your William.
If you haven't found him or his family, send me where and when he was born and his parents' info and I'll take a look.