All of the victims, ages 2 to 29, are the children of David Allen Turpin, 57, and Louise Anna Turpin, 49.
"They pretty much love any food that is fresh", he told ABC News.
Attorneys representing the adult siblings have said that the seven were living at Corona Medical Center, where they have an outdoor area for sports and exercise, and are making decisions on their own for the first time. The group of siblings are now living together in a home in rural California, according to their lawyer, and they're reportedly happy, healthy, and excited about their future.
"I just want you to understand just what special individuals they are", Osborn said. They also reunited with their family dogs.
The oldest siblings were released from Corona Regional Medical Center on Thursday and are now sharing one home under state care. Her 12 siblings were freed soon after, and the parents were arrested.
David and Louise Turpin have denied all allegations of abuse.
Their parents have been hit with almost 80 charges for beating, starving and locking up their children.
Their lawyers, as well as Osborn, could not be reached for comment Monday.More news: Death of cardinal who stood down after gay sex scandal
Beyond tasting new food, the siblings spend their time doing various kinds of occupational, physical and psychological therapy. The siblings love "Star Wars", he said. The case drew worldwide media attention and shocked neighbors who said they rarely saw the children, who appeared to be skinny, pale and reserved.
The Turpin children rarely left their Perris house and did not go to school. Trips in a vehicle at all seemed to be a rarity, Osborn said. Osborn told ABC News that one had joked about needing to wear a football helmet for safety if he ever drove.
The lawyer said the siblings are receiving continual occupational, physical and psychological therapy, and they are looking forward to the prospect of learning other adult skills, including driving a vehicle, which none of the adults have ever done.
"Some asked whether they could be nurses without having to give injections or seeing much blood", he told ABC News.
Neighbors said that the Turpin children mostly kept to themselves and indoors.
All the children except for the youngest were severely malnourished, with the eldest victim weighing only 82 pounds when she was found. ABC News earlier this month reported she had accounts on Twitter, Instagram and YouTube, where she performed a song called "Where is the Key?"
While several of them have been of driving age for about a decade, their lawyer says none has ever driven a auto.
Police have been investigating the extent of the siblings' abuse and have access to hundreds of the siblings' journals, which they hope will reveal information about what was happening in the Turpin house.