Hello John,
I'm from Kleinmuerbisch and researching all families from this small village and have information on the Kroboth's.
Your grandfather Michael Franz Kroboth born 1875 had 6 siblings (all between 1860 and 1875):
Agnes b. 1860 - marriage with Thomas J.
Maria b. 1864
Josef b. 1865
Anna b. 1867
Theresia b. 1869
John b. 1872
Please contact me directly via email
reinhard.strobl@direkt.at. I can provide you with some more information.
Greetings from Kleinmürbisch - Reinhard