My records agree with yours as to there being only two siblings of the 1830 Ignatz (that is, Anna and Adam).
His son (the 1874 Ignatz) did have five siblings, but one died in infancy, and for two, I have no information other than their birth dates.
The sibling who would be of most interest to you is Balbina, born January 27, 1880. Balbina was married twice, first in Bukovina to Szilveszter Palko, and then in Canada to Jozsef Kelemen. She has numerous descendants, most of them living in Saskatchewan.
By the way, I am living in Budapest, Hungary now (but currently in the U.S. on a family visit). September 11-23, I will be leading a trip to Tolna County, Hungary and Bukovina for Canadian and American descendants of the Bukovina Hungarians.