I am assisting in genealogical research on the STRIEGEL line and have this information which I believe may be for the Sebastian STRIEGEL to whom you refer in your post. Except for the date of birth you give, 1825, everything else seems to fit.
1. Sebastian STRIEGEL. Born in 1807 in Baden, Germany.
Sebastian first married Ludgarda NEMIRE. Born in 1802 in Germany.
In the 1850 US Federal Census for Manchester, Dearborn Co., Indiana, in the household of Sebastian STRIEGEL, there is an Elizabeth NEMIRE, 80. This is probably the mother of Ludgarda. Sebastian STRIEGEL, head of household, is 44 years old. Ludgarda, also born in Germany, is 48.
They had the following children: i. Christian. Born in 1830. ii. Lendelein. Born in 1832. iii. John H.P. Born in 1836. iv. John D. Born in 1841.
The 1870 US Federal Census for German, Iowa, records Sebastian, 63, married to a Catherine, 36.
They had the following children: i. Susanna. Born in 1853. ii. Sebastian. Born in 1854. iii. George. Born in 1856. iv. Catherine. Born in 1857. v. Christian. Born in 1860. 2 vi. Stephen (Steve) (1861-) vii. Lucas. Born in 1863. viii. Mary. Born in 1865. ix. Louisa. Born in 1867. x. Alvina. Born in 1869.
I have not yet located the parents of Sebastian STRIEGEL, but if I learn this information, I will post it.