Apple family plan
Can I share my apple one family plan with my sister that lives in Mexico?
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It depends upon where your sister has her Apple ID set up and how rigorously you obey Apple's terms of use. Sharing can only be done with members' Apple ID set to the same region or country. Technically if she lives in Mexico she is supposed to have her ID set to the Mexican Store and if you are in the USA (I presume -- you do not say) then you cannot share with her.
Share App Store, iTunes Store, and Apple Books purchases with Family Sharing - http://support.apple.com/HT201085 - "To share purchased content, all family members must use the same iTunes Store country or region."
and:
http://www.apple.com/legal/internet-services/itunes/us/terms.html#SERVICE - May 13, 2019 "Our Services are available for your use in your country of residence (“Home Country”)."