Thanks for writing. I have traced my Sandman roots to Bernardus Sandman, born 1762, died 1821 in Arnhem. He was married to Margrita Peterman. To the best of my knowledge, they had two sons, Hermanus born 1787 and Hendrik born 1791, and a daughter Anna born 1794. Since then, to the best of my knowledge, the Sandman family has been in Arnhem.
I have heard of a Sandman line in Texas but I don't know if or how they are connected to my line. I will have to research that line.
Do you know if your line somehow traces to Bernardus, either directly or indirectly? Is Sandman a common name in Arnhem or would all the Sandman families somehow be related?
I can send you a gedcom file of my Sandman line and other related families if you are interested. Look forward to hearing from you again.