Since you have his name as William on her findagrave info, this is a possibility:
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1940 census, Wyandotte, Wayne Co., MI:
Kashynski, Anthony, age 32, b. MI
Catherine, wife, age 31, b. MI
Joan, dtr., age 11, b. MI
William, brother, age 39, b. MI, occupation steel worker
This would make William about 5 years younger than Beatrice, but certainly possible for him to be her husband.