Latin American cultures have a different temporal concept than what you are accustomed to. Arriving up to an hour and a half late is acceptable in many circumstances. The educational system actually reinforces this mentality as do additional cultural factors such as conceptual truth, gossip, and family networking.
Do your students consider you as their teacher or just as a student? Power distance in Latin American cultures is also greater than in the US, being much more formal in many aspects.
Traditional responsibilities have everything to do with gender roles in Latin America. Your curriculum should cater to this fact.
As far as writing goes, most Latin American education systems do not emphasize compositions in school, much less afterwards. In my experience, most Latin Americans that travel to the US to work do not have strong academic skills in their native language, much less English. It is highly probable that they can't read or write in their mother tongue.
If you would like to talk to me further, please feel free to visit me working in my on-line school. I would be happy to talk to you there.
Eric Paul Monroe