I have confirmed that Rudolph Speelman, b. abt 1809 MD was married to Barbara Mowen, daughter of Daniel Mowen ( Jr) and Dorothea Schnatter.
Franklin County Deed Book 35: 255 clearly defines the surviving heirs of Daniel Mowen, Jr as of 27 July 1861
ABSTRACTED
Jacob LeCrone et al to Jacob Oberholtzer; Deed from Rudolph Speelman to Jacob Oberholtzer; Antrim Twp., 25 March 1853 for $ 1,218.25 the interest of the said sum to be paid to Catherine Mowen, wife of Daneil Mowen, decd, a& at her death the principal to be paid to heirs and legal representatives of deceased.
Said deed is for tract of land in Antrim Twp., bouneded by Daniel LeCrone, Mrs. Susanna Funk and Jacob Oberholtzer - 109 acres and 149 perches
And whereas said Catherine Mowen, said widow, is now deceased, said Jacob Oberholtzer has paid said sum to John LeCrone and Catherine, his wife, to Henry Omwake administrator of Dorothey Beaver, decd; to Henry Omwake administrator for Peter Mowen decd, to Henry Omwake administrator of Catherine Mowen, decd, who was the widow of Daniel Mowen, decd. To Rupolph Speelman committee of Barbara Speelman, a lunatic, and to Benjamin E. Price administator for George Mowen decd, to Elisabeth Jacobs, Mary Besore and to George Carbaugh and Snively Strickler administrator of Sarah Carbaugh decd, being all the heirs and legal representatives of Daniel Mowen, decd.
Recorded 27 July 1861..

Children of Rudolph and Barbara [Mowen] Speelman were
Melchior b. 1836 PA
Luther b. 1838 PA
Calvin b. 1840 PA
Oliver b. 1843 PA
Amanda b. 1844 MD
George W. b, 1847 MD

In the household in 1850 Antrim Twp., Franklin Co., PA was also a Catherine Speelman, 72 b. MD.
Who was Rudolph's father? Rudolph died between 1861 and 1870 - when Barbara was a widow on the census.