Jesse St. James knew the truth, even if his parents still liked to pretend that he didn't and they were good at it – hey he had to get his acting chops from somewhere.
When Jesse was 12 they had sat down and had a rational conversation about Jesse's adoption, he was the one who brought it up. His parents were surprised that he had figured it out; he explained it using genetic traits - everyone in his family is natural blondes with brown eyes, he has brown hair and blue eyes - and his parents were proud of intelligence and knew that they owed that kind of intelligence the truth. After that family discussion the topic of his biological parents was not brought up again. Internally Jesse knew that this revelation would be a perfect chapter in the memoir of his life. It would humanize him to all those who would read his story once he became a star.
Except for once, when Jesse was a freshmen. He calmly asked his mom if she knew who his biological parents were. She had paled when he had asked, before sitting him down in the living room and telling him that his mother had been a 16 year old Carmel student, who moved to Washington with her family after giving birth. His mom told him that she didn't know who his biological father was as the girl gave them no name; just that he was a singer. Jesse's mom told him that's where he got his voice from, both his biological parents were in show choirs, and his parents thought that to nurture that talent Jesse would have singing lessons and would one day wow the world with his voice.
After that conversation with his mom Jesse had researched. He looked through Carmel yearbooks and he asked a few teachers if they remembered a pregnant girl who was a student back in '92/'93. He finally was given an answer by his math teacher who told him the name of his biological mother. That night he had Googled the name and what he discovered made him break down at the computer. He read that his bio-mom had been killed in a car accident and though Jesse had never even known this woman, her death brought him to tears. It was that emotion – anger, for never knowing his bio-mom and sadness at her passing – that got Jesse a solo spot in Vocal Adrenalin as a freshman.
From that point on Jesse rarely thought on the fact that he was adopted. He had everything he needed, he was happy and he loved his parents. They supported his dreams to be a star; vocal lessons, dance lessons, acting classes, anything really and in return Jesse made them proud with good grades and with unwavering determination. In fact had Jesse not been adopted he probably wouldn't have half the talent he does now, and a much smaller ego (which in most cases was a show for strangers, Jesse was really more laid back and a goofball away from the demands of school and Vocal Adrenalin).
Though some days all Jesse thought about was his biological parents. He used the emotions that being adopted gave him to become characters, to work on his acting. It was on those days that he would returned to the book marked tabs on his browser and try to find information on his bio-dad. So far he had been unsuccessful, three years and nothing on the mysterious show-choir member dad. That was until Jesse decided that maybe his coach Shelby would know, she had been around during that time and the world of show-choir was small. Through a few of her connections Jesse found out the truth about his biological father.
So yeah Jesse St. James knows the truth about who his "father" is, what he doesn't know is how that truth is going to change his life.