Patricia, who portrays a real-life psychic crime buster on the hit show, fears her brother will get his own back on her for years of torment when he takes charge of the drama.
She says, "I was always a bossy little girl and, being David's older sister, I've bossed him around quite a bit.
"Now that he'll be directing me, it will be payback time!"
But Patricia still can't wait to see what her little brother brings to the set: "I think it will be really interesting being directed by David because he knows me so well and I feel so safe with him. I think I'll be able to go to some of my darkest places."
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