At that time, there were many rumors about who did the killing. One of the suspects was one of OJs sons. This son had a reputation for violent, bizarre behavior. The assumption was that OJ had decided to steer suspicion away from the young man and bear the brunt of the murders himself. OJs daughter probably knows the true story. She and her brother have learned to keep a low profile and stay out of the news. Last I saw of her in photos, she had piled on a tremendous amount of weight.
OJ is too selfish and egotistical to care that much about his son.