The Bilson family is like many other families: three kids, a cat, and a small, lovely home with lots of family photos and carved wooden wall signs with sayings like “Live, Laugh, Love.” But step inside their house after 4 p.m. most weekdays and you’ll want to cover your ears because of the noise — the screaming, to be exact. These are not the shouts of sibling rivalry or parental annoyance. This is the high-pitched, ear-shattering sound of a 13-year-old girl. More accurately, it is the sound of a frustrated, irritated, very loud teenager with autism.