I want to know how to say the word: "Grandmother" in American Indian language,
preferably Souix Indian.

Hello Bearsmoore,

The "Lakota Translation" page is a dictionary of over 3300 words that
are translated from English to the Lakota- Sioux language.

Grandmother (I have for), UCIYAWA 
Grandmother (his/her),    KUSITKU KI
Grandmother (my),         UCIWAYEKI
Grandmother (your),       NIKUSIKI 
Grandmother,              UCI
Grandmother,              KUSI

Source: Native Web
http://www.nativeweb.org/hosted/language/Lakota_translation.htm


Sioux Heritage offers translations of words and phrases of people, the
human body, colors, months and numbers.

The translation for the word grandmother is: Unci (or) kunsi

Source: Sioux Heritage Website
http://www.lakhota.com/page4.htm#People


From the Unci Sioux website: 
“Unci is a Lakota word for Grandmother.” 
http://www.uncisioux.com/


Search Criteria:

translation Sioux English
Lakota Translation


I hope you find this helpful and if you need any clarification of the
information I have provided, please post a clarification before rating
my answer.


Best Regards,
Bobbie7-ga

Very thorough information, easy to understand.