What was the dark side of Bob Ross's life?

The dark side of Bob Ross's life refers to lesser known struggles and business conflicts behind his cheerful TV persona. Bob Ross was a gentle, positive host of The Joy of Painting, but he had difficult early life, served 20 years in US Air Force, where he was a drill sergeant known for being tough and yelling, which he disliked and vowed never to yell again after leaving. His personal life had hardships, his first marriage ended in divorce, his son Steve had strained relationship, and he had health issues later with lymphoma that led to his death at 52 in 1995. The biggest dark side was business dispute, Bob Ross Inc. was largely controlled by his business partners Annette and Walt Kowalski, who trademarked his name and controlled his image and products, and after his death, they had legal battle with his son Steve Ross over rights to his name and paintings, with allegations that Bob was exploited and wanted his son to inherit, but Kowalskis retained control. Some reports say Bob Ross painted thousands of paintings but few sold, and he made little money from paintings themselves, mostly from teaching. So dark side includes tough military past, family and health struggles, and exploitation by business partners over his name.