# Mom With Downs Syndrom + Dad With Downs Syndrome = Kid With Downs Syndrome

**URL:** <https://boards.straightdope.com/t/mom-with-downs-syndrom-dad-with-downs-syndrome-kid-with-downs-syndrome/536853>\
**Category:** Factual Questions\
**Created:** [April 21, 2010, 2:24pm UTC](https://boards.straightdope.com/t/mom-with-downs-syndrom-dad-with-downs-syndrome-kid-with-downs-syndrome/536853 "2010-04-21T14:24:20Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![ToeJam](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@ToeJam](https://boards.straightdope.com/u/ToeJam)\
**Post date:** [April 23, 2010, 3:38am UTC](https://boards.straightdope.com/t/mom-with-downs-syndrom-dad-with-downs-syndrome-kid-with-downs-syndrome/536853/21 "2010-04-23T03:38:40Z")

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And on the Mosaicism issue- if the father had the mosiacism thing too with HIS sperm also being normal sperm, then fine, they together would have perfectly healthy children \*barring random mutations or such things.

Fine. That beats my Translocation 25% answer.

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**Author:** ![Nava](https://avatars.discourse-cdn.com/v4/letter/n/da6949/32.png) [@Nava](https://boards.straightdope.com/u/Nava)\
**Post date:** [April 23, 2010, 7:57am UTC](https://boards.straightdope.com/t/mom-with-downs-syndrom-dad-with-downs-syndrome-kid-with-downs-syndrome/536853/22 "2010-04-23T07:57:12Z")

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> [@Cosmic Relief](#):
>
> A man with Down syndrome will almost certainly produce no children at all, so no.

“Almost certainly” isn’t quite the same as certainly. I know of two families where both parents have Down’s and which do have children. One couple has a single son (with Down’s), the other one has two children (but I don’t know whether they have Down’s, all I know is that they’re being raised by relatives).

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**Author:** ![HMS\_Irruncible](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/hms_irruncible/32/7394_2.png) [@HMS\_Irruncible](https://boards.straightdope.com/u/HMS_Irruncible)\
**Post date:** [April 23, 2010, 11:14am UTC](https://boards.straightdope.com/t/mom-with-downs-syndrom-dad-with-downs-syndrome-kid-with-downs-syndrome/536853/23 "2010-04-23T11:14:25Z")

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> [@Nava](#):
>
> “Almost certainly” isn’t quite the same as certainly.

Hence, the “almost” qualifier.

> [@](#):
>
> I know of two families where both parents have Down’s and which do have children. One couple has a single son (with Down’s), the other one has two children (but I don’t know whether they have Down’s, all I know is that they’re being raised by relatives).

The Down syndrome man is almost certainly not the biological father of those children.

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