Well, only if the ability to lucid dream is a dominant trait! If it's recessive, you'd want 2 LDers. There's the chance you could have a heterozygote, but if it's recessive you'd want to just have two homozygotes for maximum probability.
Of course, look at polydactylism haha
i think he assumed that LDing is not hereditary, but as long as a member of a family can do it, he or she can maybe get the rest interested.
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