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When George Sr. asks Sheldon to keep a secret from Mary, the stress of not being honest drives Sheldon to hideout at Tam's for his first sleepover.
When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.
Dr. Sturgis recommends Sheldon and Missy for a university research study on twins, and Mary is unhappy when the test results go to Sheldon's head.