And a warm howdy to you as well! Thank you for your thoughtful post. Please note one minor correction: only one of Prem's four children is taking the courageous and painful lead to bring this to light. The rest of my reply is not directed at you, but rather an attempt to make what's come to light clearer to anyone who may be reading about it for the first time.

Aside from the words of one of the victims, the best source is a recorded conversation of a family meeting that was arranged by one of Prem Rawat's daughters for the purpose of confronting Prem about allegations of childhood sexual abuse. The family meeting was attended by Prem, both of his daughters and one of his two sons (three of his four adult children) and recorded by the son. During that meeting, the son confronted his father:

Son: So I have a question for you Dad, uh did you not know that inappropriately touching a child's genitals was immoral and would have negative impact, a life changing impact on (name omitted for privacy of another victim) and I?

Prem: Is that a q... are you asking me that question?

Son: Yes.

Prem: Now I realize that that's true, now I do, I do, I do.

Son: But back then it didn't occur to you?

Prem: No, it didn't and the reason why it didn't... because in our family, in our, in our whatever India was, it was very common. It was not a, it was not a taboo thing.

Son: Did you know that Mum also abused me but refuses to admit it. When we lived in Miami in the early 80s she directly sexually abused me in an incestual manner.

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The full recording is much longer. Many people have either heard it first hand or read the relevant portions of a transcript. The victim has also spoken out on Facebook and I've been informed that in addition to the recording, there is substantial documentation concerning family members' knowledge of these events and their attempts to keep it under wraps.

Prem, in front of his son (one of the victims) and both of his daughters, admitted to sexually abusing two of his children. Additionally, Prem and his two daughters listened as his son (their brother) stated that he had been abused in an incestual manner by his mother, Marolyn Rawat.

The son and his wife courageously brought this to light against the wishes of and with no support from any of the other family members. Both daughters continue to promote their father from positions at or near the top of two of his organizations. Many of Prem's followers who became aware of this continue to engage in reprehensible behavior that includes the fabrication and dissemination of false narratives and shameless attempts to discredit the victim and his wife. 

As far as I know, Prem is doing nothing to protect his son and daughter-in-law from his followers' shameless character assassination, even as he and other family members know the truth of the sexual abuse that he admitted to.

According to the victim, the abuse continued until he was six or seven years old. Setting aside the fact of his American wife, that indicates that Prem had at least a decade to learn about and adapt to western culture (Miami) in which childhood sexual abuse is a crime.

I'll leave it to the readers here to draw their own conclusions about the far-reaching implications of all this.