Genie Wiley-The Feral Child
This may be one of the most heinous cases in the United States, but this situation has been reported (in the past) to occur many times in China when girls are born into a family.
Genie Wiley lived in the dark room of her home for nearly 13 years of her life. When they finally discovered her she couldn't walk, talk, or even chew. At 13 years, she weighed 59 pounds.
But tragedy also stuck her sister, who at the age of 10 weeks died from pneumonia because her father left the child in a freezing garage. Her father hated children.
Even when Genie was finally removed from her home, the happy ending just didn't exist for her.