I hope this link from family search works
https://familysearch.org/pal:/MM9.3.1/TH-1942-21258-13808-90...Shows his probate will and lists his children/heirs on page 2 and 3, i did not read further then that.
Following census from automated genealogy
also found 3 of his children in 1911 census
Karolina, Eva, Karl
30 30 Schmidt Karl Lot 6-7, Bl. ? M Head M Oct 1879 31 01*
31 30 Schmidt Karolina F Wife M Oct 1886 24 1*
32 30 Schmidt Karl M Son S Sep 1905 5
33 30 Schmidt Joseph M Son S Dec 1909 1
34 30 Wolf Eva F Servant S Oct 1895 14
35 30 Volt(?) John M Lodger M Dec 1886 34
36 30 Volt(?) Elisabetha F Wife M Mar 1889 22
37 30 Volt(?) Maria F Daughter S Jun 1910 1
38 30 Wolf Karl M Servant S Dec 1893 17
Possible family in 1906 census
Fritz Jacob Head M S 18
2 204 Wolf Lucie? Mother F W 48
3 204 Wolf Charles Step-brother M S 11
4 204 Wolf Eva Step-sister F S 8
Possible Lucy in 1911 census
14 117 Lantz Jacob M Head ? Aug 1899 2?
15 118 Wolfe Lucie F Head W Oct ? 62