Terry Jo Bichell is cut off in the middle of her sentence by a loud shout.
"That's Louie, giving his two cents worth," she says with a smile. "Even though he can't talk, he can make himself heard, let me tell you."
Bichell and her family live in a laidback farmhouse in Brentwood, where she's a doting mother to her 16-year-old son Louie. He's tall and friendly, and he loves dessert. His gestures are often clumsy. She does her best to interpret them.