I also am looking into this line, I descend from John (?) Garrison - who I believe is a brother to James - John would have married a Laviana Kimbley in Knox Co., IN and had one child, William Curtis Garrison - Laviina married two more times and ended up in Texas by 1880.
Have more information on and some cemetery photos - feel free to contact me.
George Frantz
Lafayette, IN
gwfrantz@hotmail.com