Mexican Culture is a huge and vast subject. I have done a little research and posted some interesting links below. The internet is so wonderful in that it is a huge library and that when I first started studying about the architecture in Mexico in the 1990's, I had to read books that were already quite old as the info took 10 years to just be made into a book. Anyways, my point is there is a ton of info out there, not all correct and perfect, but keep an open mind and research and learn about the world around us. Mexico has a rich and wonderous history, learn and share this with your children, it will be invaluable.
http://en.wikipedia.org/wiki/Culture
http://en.wikipedia.org/wiki/Culture_of_Mexico
http://www.peyotepeople.com/culture.htm
http://www.aboutoaxaca.com/oaxaca/tourism.asp
http://www.tomzap.com/coaxaca.html
http://www.oaxacainfo.com/we-love-oaxaca.htm
http://www.roadtomexico.com/oaxaca/festivals.htm
Culture is consists of these Basic Categories:
Language, Religion, Art, Architecture, Literature, Holidays, Cuisine, Music, Cinema, Sport
http://en.wikipedia.org/wiki/Languages_of_Mexico
As stated on Wikipedia in the above link:
Spanish is the de facto language spoken by the vast majority of Mexicans, though the Mexican government does not legislate it as an official language.
Nonetheless, the second article of the 1917 Constitution defines the country as multicultural, recognizes the right of the indigenous peoples to "preserve and enrich their languages" and promotes "bilingual and intercultural education".
While many people believe Spanish to be the language of Mexico it actually has many different indigenous languages, approx 6 million speak indigenous languages.
Some of these are Nahuatl, Yucatec, Mixtex, Zapotec, Tzeltal Maya, Tzotzil Maya, Huichol and many others. Please check out the Wikipedia link above to see the many different diverse languages that actually exist in Mexico.
Religion
http://www.latinamericanstudies.org/mexico-religion.htm
Art
http://www.theartofmexico.com/gallery.htm
http://www.nationalmuseumofmexicanart.org/
http://www.nationalmuseumofmexicanart.org/education.html
http://www.folkart.com/home/mex.htm
http://www.artedemexico.com/3architectural.html
http://www.peyotepeople.com/art.htm
http://www.peyotepeople.com/beads.htm
Architecture
http://en.wikipedia.org/wiki/Architecture_of_Mexico
Mesoamerica, Pre-Classic, Classic, Post Classic Periods, Colonial, Haciendas, 19th & 20th Century, Modern & Contemporary
http://www.tropicalshade.net/ How to build a Palapa
http://www.palapastructures.com/
http://www.youtube.com/watch?v=pZTG_iYiBYk Melaque, Building a Palapa roof from Palm Fronds
http://www.youtube.com/watch?v=bKGpQtOEiJc
Palapa Roof Braiding
http://library.thinkquest.org/16545/data/low/mayan.htm
http://www.criscenzo.com/jaguarsun/palenque.html
http://en.wikipedia.org/wiki/Toniná Tonina
http://www.mayasites.com/tonina.html
http://www.artdaily.com/index.asp?int_new=38026&int_sec=2
This is as much research as I could do right now. I will continue to research and post relevant materials.