When he was three, Gabe's mother abandoned him on the streets of Calcutta, but he was adopted by a young American couple. Gabe seemed happy in America, but he secretly felt like an outsider. In high school he started to rebel and resent his Christian upbringing.

Forty-year-old Jeff was once known as a heroic firefighter after he saved his partner's life. But Jeff was traumatized by the harrowing event, and his drinking increased drastically. Jeff has received two DUI's and been rushed to the hospital numerous times for seizures. Jeff's alcoholism has also forced his son

Identical twins Sonia and Julia, 22, shared everything as children and grew up in a loving home. Their parents emigrated from Poland and worked multiple jobs to send their children to the best schools.

When he was five, Donald's parents divorced. He longed for a strong father figure, but his father had very little contact with him. Donald became a gifted boxer, but ultimately chose drugs over his career. He joined a violent gang and turned to stealing to support his crack habit. Now

Jason grew up in a seemingly perfect upper-middle class family in Littleton, Col., but he struggled to gain his father's approval. When Jason failed to make the baseball team his freshman year, Jason and his father were devastated.

When she was young, Nikki's mother and grandmother worked hard to give her a good life. Nikki excelled in school, but she was devastated when her grandmother died. She began hanging out with a rebellious crowd, skipping school, and using crack. Nikki eventually had two daughters, but has remained addicted

Now 43, Bret once had a promising career in real estate. But the stress to make more money to provide for his family took its toll, and Bret became an alcoholic. Two years ago, Bret's family held an intervention and sent him to rehab programs, but he relapsed. His wife

While Andrea was growing up, she yearned for a relationship with her mostly absent alcoholic father. During high school, she sought solace with her boyfriend, moved out and started a family at 19. Andrea soon became overwhelmed with parenting duties and turned to alcohol. As her drinking escalated she turned

Aaron was a mixed martial arts champion, but at the height of his career he started working in adult films. Through the porn scene, Aaron was introduced to crystal meth. His daily habit took over and he lost both his film and fighting careers.

Although she has two loving children and an adoring husband, Danielle is dangerously addicted to Percocet. As a teen, Danielle felt neglected by her alcoholic father and began cutting herself.

With a terrifying addiction to heroin, Joey's career as a tattoo artist is in jeopardy. His parents divorced when he was three. At 13, Joey started smoking marijuana and soon graduated to ecstasy, LSD, and heroin. When he stole his mother's credit cards, she reluctantly filed charges and he went

 Sebastian, 21, and his brother Marcel, 20, were soccer celebrities in their town at a very young age. Cool and rebellious, Sebastian hung out with older teammates and started doing marijuana, cocaine and meth.

At 53, Gloria prides herself on being a good cook and an independent, fun-loving woman. But Gloria uses her cooking and charm to manipulate her family into letting her drink as much as she wants. Gloria had difficulty raising her children, and was married to an abusive man. At 42,

To outsiders, Marci's family life seemed ideal. But while her mother worked, Marci was left home with her alcoholic father. She endured his abuse while her mother looked the other way. Marci began drinking and doing drugs. Her marriage failed, and she lost custody of her children. But her mother