Creek is a Muskogean language with about 4,700 speakers in the US states of Oklahoma and Florida. It is spoken by the Muscogee (Creek) Nation, the Seminole Nation of Oklahoma, and the Seminole Tribe of Florida. The language is also known as Muskogee, Muscogee or Seminole.
Creek first appeared in writing in 1736. Laws were being written in Creek from 1849, and a standard alphabet, the 'National Alphabet', was adopted in 1853. By the 1870s newpaper articles in Creek were being published.
source
wikipedia.org, omniglot.com & ethnologue.comHealth
Definitely endangeredolder brothers