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Tolerance may vary between individuals. Similar to high-carb diets. Some people can tolerate it well, while others will develop diabetes. Some of the difference can be explained by genetics, but it's still early days.

Among family members you have way less genetic variation than between regular random people.

Probably some degree of genetic predisposition. Just because glyphosate may trigger gluten intolerance in some people doesn't mean it'll have that exact same effect in everybody else, even within the same family.

It can easily mean that, like gluten allergy, the Glyphosate allergy also has a genetic component. One that is more widespread perhaps.

For the same reason your similar genetic makeup did not make you all look identical.

Certain genes leave you more "prone to" certain conditions.

My brother is autistic and I'm not.

We are identical twins.