Hi- do you know what your Albert Barnett's original name was in Prussia? Have you been able to find his ship's manifest yet?
I just saw the castle garden record you are referring to and it said he was born in Germany. I have no knowledge of any familiy from their. Sorry....good luck
are you related to Arthur Berndt
PO Box 99
426 Maverick Farm Rd
Sharon, VT 05065
He was looking for family from Germany according to the JewishGen.org family finder database. but his contact info is from 2006, Have you looked on that site?