Tyne & Wear archives have some records for the Jewish community - see this user guidehttp://www.twmuseums.org.uk/userfiles/UG8%282%29.pdf
which also mentions
From Kretinga to Sunderland: A Jewish chain migration from Lithuania 1850-1930s by Gordon Leigh, MA thesis 2002 [in searchroom library]
May be worth a look if you ever visit the area!
Also Durham records on line has a few Sunderland cemetery references for Bernstein - it may be worth seeing if other family members had come over earlier than 1908.http://www.durhamrecordsonline.com/
Hope this is of interest.