From going over all the information i have on Rothermels/Roadarmels and etc i have found to possiblities for your family.
One Samuel was born 7/25/1804 and we have no information on him other than that.The other one is a Samuel along with a sister Susannah whoes mother died when they were young. We have no birth date on either of them but there father remarried and the first child by his second wife is born in 1808.
Please email me directely under jhn_waugh@ yahoo.com and we can work this out and see where you connect if we can connect you with one of them then i can take your family back to Germany from that point on.
Thanks for contacting me but it is easier if you email me directly.