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Elizabeth Holmes has three people to be thankful for this holiday season ... her husband and their two children -- who went to visit her in federal prison.

The disgraced former tech CEO sat in the yard of Federal Prison Camp Bryan in Texas Friday -- where Ghislaine Maxwell and former 'Real Housewives' star Jen Shah are also locked up -- to spend time with her husband, Billy Evans , and their two kids. Backgrid

Elizabeth and Billy are sat across from one another seemingly just catching up while their kids milled about ... though Elizabeth didn't stay seated for too long.

At some point during the afternoon, Elizabeth stood and swung her son, William , around ... like any mom playing with their kiddo at the park. Backgrid

She also he

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