Teen mom farrah abrams mother said the child's father did bad things to farrah what did he do?

Farrah Abraham's mother, Debra Danielsen, has made various claims about Farrah's relationship with her child's father, Derek Underwood. Debra has suggested that he was involved in negative behaviors, including substance abuse and issues related to his character. These claims have been part of the broader narrative surrounding Farrah's experiences as a teen mom and the challenges she faced in her relationships. However, specific details about the allegations may vary depending on the source.