Just two days after losing his 16-year-old child, John Travolta's role as a health advocate and protector to his son is described in detail from the people who know him best.

Longtime friend and Chief Counsel Mike Ossi tells ET in a long-form interview from the Bahamas, "John not only dealt with his sons condition on a day-to-day basis, having nannies and qualified people who have been working with him, non-medical personnel working to help him in the capacity of overseeing his son's every move, but he also had some of the finest medical doctors in the world helping and advising. His focus was to try to limit the number of seizures his son had and he used some of the finest medical authorities and followed their advice in regards to the appropriate medication which would limit the amount of seizures. His son was actually on anti-seizure medication until it became ineffective. In other words, his seizures went from every three to four days, to every 21 days when he started the anti-seizure medication."

Ossi elaborates on Jett's previous condition: "However, after a couple of years, the seizures came back to the pre-medication time and the side effects were horrible and the damage that this strong type of medication can do to your body far outweighed any benefit. So, during the past, I would say, year, he was not on anti-seizure medication based on the doctor's advice."

Ossi goes on to say, "I will defer to doctors and medical experts, but I don't want anyone to think that John and Kelly did not utilize all available medical and non-medical experts in an attempt to protect the interest of his children."