On-screen siblings like Marcia and Greg Brady may be the definition of family goals, but their real-life chemistry wasn't as innocent as the one we saw on TV! It turns out Maureen McCormick and Barry Williams had a romantic relationship — and they aren't the only ones who found love with their fictional family members!
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Click through the gallery to see which other stars have dated their on-screen family members in real life!
While they played alien siblings on Roswell, they dated for a year and got engaged. However, they broke up a few months after their engagement.