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According to the book: not technically. He's only Alison's step-dad. Ali's mom and Spencer's dad had the affair AFTER Jason was born. However, this may change with the TV series, because they changed EVERYTHING in the show.

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12y ago
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6y ago

In the books Jason is not related to Spencer Hastings. Spencer's dad had an affair with Alison's mom, Jessica DiLaurentis. This resulted in her getting pregnant. Alison and Courtney are twins and the daughters of Jessica DiLaurentis and Mr. Hastings. Jason is the only legitimate child of Mr. and Mrs. DiLaurentis. Therefore, Jason is not related to Spencer. Spencer's only siblings are Melissa (full sister) and Courtney and Ali (half-sisters).

However, in the TV series Jason is Mr Hasting's son, and Alison isn't.

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10y ago

basically. yes Jason is Spencers half brother and they are related because they have the same dad. x

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12y ago

Apparently Alison and Courtney (Alison's twin) dad is Spencer's dad.

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12y ago

It's likely because his acting mysterious

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Q: Is Spencer's dad Ali's real dad in Pretty Little Liars?
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