What's the most people with Down's syndrome in one family?

I have 2 daughters with Downs syndrome. My brother also has it. And I also would have had a cousin with it except my aunt did not keep the pregnancy.

I have 2 daughters with Down's syndrome. My brother also has it. And I also would have had a cousin with it except my aunt did not keep the pregnancy. I'm wondering how common this is. I do not have any form of downs. I have been told it's not genetic but apparently for our family it is. My mom also told me that looking through family history it looks like there have been more. It's ALL from my dad's side of the family.

or:I have 2 daughters with Down's syndrome. My brother also has it. And I also would have had a cousin with it except my aunt did not keep the pregnancy. I'm wondering how common this is. I do not have any form of downs. I have been told it's not genetic but apparently for our family it is. My mom also told me that looking through family history it looks like there have been more. It's ALL from my dad's side of the family.

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