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The siblings you name are not directly connected with my branch of the family. Neither are they shown for the period 1850 - 1864 in other Worms branches I have researched.
In your prior message, you mentioned you "have the connection to Germany and the city there." I suspect that means you have positive proof or a fair idea of the village, town or city from which they came. If so, you could direct a brief, clear and polite letter of enquiry to the parish priest/pastor, and enclose a donation. No doubt, there is also a weekly newspaper for the area, and it is possible your letter would be published, as such information would be of interest to the readers; you could simply write to: Der Redakteur, Die Zeitung (then the name of the town or region).