Acultural-familial intellectual disability normally falls in the category of intellectual disability.

The correct answer to this open question is the following.

A cultural-familial intellectual disability normally falls in the organic category of intellectual disability.

For instance, we have the case of mental ret*rdation that can be caused by organic factors. Past scientific knowledge stated that environmental factors such as lack of education or poverty were causes of mild ret*rdation. However, modern studies affirm that organic causes such as single gene defects, chromosomal abnormalities, and congenital factors can cause mental ret*rdation.