Another reason might be related to a cult. If Rosalynn was unfortunately involved with a cult, they might have held her captive for ideological control. They could have used various means to keep her from leaving, such as brainwashing and physical confinement. In cults, members are often deprived of their freedom and made to conform to the cult's will.
It could also be due to a power struggle within a family or a group. Maybe Rosalynn knew some secrets or was in the way of someone's inheritance or leadership within the group, so they kept her in captivity to silence her or keep her from interfering. For example, in some historical feudal families, such things did happen where family members were locked away to protect family 'interests'.
One possible reason could be a case of mistaken identity. If there was some sort of criminal or political target, and Rosalynn was wrongly identified as that person, she could have been held captive for 19 years.
If Rosalynn is a relatively unknown individual who has such a tragic experience of being in captivity for 19 years, it could be that she was a victim of some sort of illegal or unethical situation. Maybe it was a case of human trafficking or a private act of imprisonment by a criminal. However, without more information, it's all just speculation.
One reason could be a medical condition like incontinence. Some kids have problems with their bladder or bowel control due to issues with their nervous system or other physical problems. For example, if a child has spina bifida, it can affect the nerves that control the bladder and bowel, leading to the need for diapers.
Maybe he got lost in some remote area. Or he could have been kidnapped and held captive by bad guys.
It could also be psychological. Maybe the child has experienced some sort of trauma that has regressed them to a state where they feel more secure in diapers. Stress or major life changes can sometimes cause such behavior.
Rosalynn's back story in Fallout 76 involves her being a part of the post - apocalyptic world. She might have had a family before the nuclear disaster. Maybe she was a simple person trying to survive in the chaos that ensued after the bombs fell. However, without more in - game details, it's hard to say precisely all aspects of her back story.
One reason could be natural disasters. For example, a powerful tsunami could have swept the village away completely.
One possible reason is false accusations by jealous or spiteful individuals. Maybe someone wants to get revenge on the defendant for personal reasons, so they make up a false story about a crime. Another reason could be faulty forensic evidence. Just because a test result seems to point to the defendant, it doesn't mean it's accurate. There might have been errors in the laboratory or during the collection process.
One reason could be fear. The mother might be afraid of the reaction from her family or society. Another reason is a broken relationship. If the parents are no longer together or on bad terms, the mother may choose to keep the baby a secret.
One possible reason is lack of communication. If the couple doesn't communicate well, misunderstandings can lead to one feeling neglected and then seeking affection elsewhere, thus betraying the other.
Maybe the story is too personal or contains some secrets that Queen Elly doesn't want to be made public. It could also be that parts of the story are not suitable for a general audience, or there are elements in it that might cause controversy.