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Bride Shelby Sacco Spinek surprised her mother-in-law, Rachel Spinek, by wearing her vintage '80s-style wedding dress during her first dance at her reception in Michigan on Aug. 16

"I wanted to also fulfill that dream for my mother-in-law, even if she thought it was a dream that would never happen because she only had boys!" Shelby tells PEOPLE

Rachel was emotionally moved by the sweet surprise and "hysterically cried" for 20 minutes

A bride left her mother-in-law in happy tears at her wedding.

Ahead of Shelby Sacco Spinek 's intimate backyard wedding to Jake Spinek, 31, on Aug. 16 in Rochester, Mich., the bride, 28, enlisted her now-husband's "entire family" to help her execute a special reception surprise for her mother-in-law, Rachel Spinek, 56.

"It took everyone to

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