I read your message. My question to you:
immigrated Franziska Fellhauer together with their siblings Anton and Andrew in the USA?
My information is:
Anton ROTHERMEL, * 11/01/1816 at Rotenberg + On 08/04/1888 in San Antonio.
Andreas ROTHERMEL, * 22/10/1818 at Rotenberg + On 08.23.1846 in Bellville. = Oak Knoll Cemetery in Bellville.
You wrote that 3 siblings emigrated.
was Frances the third person? If so, when and where do they died?
Excuse my bad English. I have to use a translator.
Greetings from Mühlhausen