From my understanding:
They planned for the next generation to have the Water of Life-empowered male. Hence why his mom was supposed to have a girl and why he just barely survived taking the poison. They figured he was dead/going to die so they sent the one Reverend Mother to seduce Feyd-Rautha (his cousin that he fights at the end of the movie) so they could try again with the genes. This is why after seducing him she mentions she was able to secure a child and use her powers to ensure it was a female.
Too accustomed to using || on discord for spoilers lmao
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http://www.gamefaqs.com/boards/852-nofunallowed
https://www.youtube.com/watch?v=b39VhSOxRcE
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