Then

Sam and Dean had a happy life, until one night the two young boys witness their parents murders. Now they hop from foster home to foster home, stuck in an unfair system and abused by those that take care of them.
Sam hasn't spoken a word since that night, Dean is plagued by nightmares .
One day, they have enough of the constant pain, ready to run away and leave it all behind when they end up with kind Bobby who takes them in and cares for them.
Then they meet the Novak's and things really, really start to look up for them.