Where does genetic, inherited hair loss/AGA come from? Is it inherited on mother's side, father's side, grandparents?

Male pattern baldness is inherited on the X chromosome and comes from the mother's side. Therefore, look towards the mothers father. For women, it can come from either the mother's side or father's. There is a 12% rate of non adherence to either pattern. Hope this helps. Good luck.

İt is very complicated issue and no one knows answer . Some of my patients (male of female) has AGA with no family history as they know. (But actually they may not remember or know history/type of their whole family hair loss). Secondly ,  it is multifactoral issue that one may have the recessive gene and may express hair loss with environmental factors. 

For women with FPHL/AGA, family history doesn't help much, except for early onset AGA in the teens and 20s. Then we see more of a link. But to answer the question posed, the genetics comes from both sides of the family and often skips generations Many, many women with FPHL do no have much in terms of a family history of AGA.

It is multifactorial.  The gene loci for hair loss is located on over 100 different gene locations.  Any combination of the products this gene produces results in variability in hair loss.  As this can be obtained from both maternal and paternal sides, the etiology of hair loss becomes mutlifactorial.  To continue further, environmental and nutritional factors also play major roles in the follicular unit life span.

I don't know of a genetic thread for CTE in women that has been recognized so looking at your heritage may not help.