By the way it’s my nephew who is age 42 that has the MEN type 2B medullary thyroid cancer .
My sister had it and passed at age 59 back in 2018 .
So she had two kids that had it and then her daughter had two children and one of them has it but my my brother and I did not get it , nor did our parents have it so it must have been a mutated gene maybe that started with my sister …