Anyone know the name of this fiction horror book of the 90s, perhaps with the word "green" in title?

There's a book I had read in the 90s. The cover had a picture of a window through which a creepy tree branch was trying to get in the bedroom of a boy. The story was about twin brothers, one who was born without legs but would run about on his arms. Their grandfather would tell them stories about green ghostly creatures who would steal bodies of humans because they wanted to know what it feels like to taste, smell, etc. But they preferred humans who could see them so they wouldn't feel lonely and the twin with the intact legs could. His brother was playful and doesn't believe in the story but one day ends up in the grips of the creatures who take over his body. First signs of his twin being taken over are that the twin is obsessed with tasting different things but the twin turns evil and even murders his brother's girl friend as they turn older. Later he believes his twin has died. Years pass and the brother returns back home with his daughter and son only to find that his evil twin is still alive and torturing his family.

The only thing I remember is that there might be green in the title of the book, but I could be wrong. Anyone know which book I'm talking about?