"Grandma spoke low german dialect and that is cohesive with this region"
low german is spoken in Germany´s north.
http://en.wikipedia.org/wiki/Low_Germanaustrian dialects have another orgin!
http://en.wikipedia.org/wiki/Austrian_German#DialectsUpper-Austria has many of the church-books online:
http://matricula-online.eu/>>>
Zu den Matrikelbüchern ...
Akzeptieren
AT Österreich / Austria
AT-OOeLA Oberösterr. Landesarchiv
take place in list A-Z