We have Pennsylvania death certificates for all six of them.  Here is a synopsis. (dk=don't know)

Deceased Year B'place B'year Father Mother Father on gravestone Bernard 1918 Austria 1837 dk dk Moshe Zvi Bluma 1923 Austria   Motka  Bernstein dk Mordecai HaKohen   Olga 1965 Russia 1874 All four show father as Bernard Pickholtz dk not named Harry 1957 Austria 1880 Bluma Bernstein Berisch Anna 1959 Europe   Bluma Dov Ber Fannie 1939 Odessa 1884 Sarah Bernstein not named At this point, it appears a) that the family moved around a bit in Europe and b) Bluma was also known as Sarah.

This is from Bernard's death certificate.  I think it gives his mother's name as  "don't Austria" instead of "don't know."

Note:  We know of at least two "other" Bernstein families in Skalat who are kohanim.  I assume they are all connected.

Then things got seriously complicated.  Here is an excerpt from the 1890 passenger list.

	Given Name Surname Age Berisch Pickholtz 49 Sara " 47 Olga " 15 Chana " 9 Fanny " 8 Blume Bernstein 34 Hersch " 9 David " 11 mos	Well look at this! Berisch is married to Sara and Bluma is a different person.  What happened to Sara? Bluma - who has children - is going by Bernstein, which we thought was her maiden name.  Who is their father. Hersch (Harry) is Bernstein (not Pickholtz?). Who is David?  He is not with Bernard and Bluma in the 1900 census.
Also: a) They are all listed as a group as coming from Skalat and  b) Sara and Blume are both listed under "occupation or calling" as "wife," implying a husband (or not?).

Based on Fanny's death certificate which said she was born in Odessa, Steve (Harry's grandson) had a search done of Odessa birth records and found two.  Fanny was born in 1881 (not 1884) and her mother was Sara.  A son Vodolya (often equivalent to Vladimir, William, Zeev, Wolf etc) was born 1883.  His mother is Sara as well and in neither case is their any further identifying information about Sara.  Since Vodolya was not on the boat to the US, we assume he died prior to the voyage but  if so, it was not in Skalat.  The Odessa researcher looked for the other children but didn't find them, so we can assume they were not born in Odessa.

So what do we do with this?  My theory (and the logic behind it) ...

• Fanny - who had no children - died long before the others and the informant for her death certificate was her sister Anna.  I am therefore going to assume that the information there is correct.  (In all the other cases, the informant was a child of the deceased, who may have not known certain aspects of the family history.)  The key information contained only in Fanny's death certificate is that Sara's maiden name was Bernstein.  I cannot believe that Anna erred on this.
• Sara and Bluma are sisters.  Berisch and Sara decided to go to America and came back to Skalat to take Sara's recently widowed younger sister.  Soon after arriving in the US, Sara died and Berisch married Bluma - a frequent solution in those days.
• Remember that Berisch and Sara had only daughters, after Volodya died.  In marrying Bluma, Berisch also took his nephew Harry as a son - someone to say kaddish after him.  I don't know if Harry's children had a clue that this was the case, but I doubt it, since Berisch's name appears as Harry's father both on his grave and on his death certificate.
• Somewhere in the Philadelphia area are the graves of Sara and the child David (perhaps listed as Bernstein, perhaps as Pickholtz), who died between 1890 and 1900, probably earlier than later.  We have not been able to find them so far.  If David died first - before the families were "merged" - it would be interesting to see the space "father's name" on the death certificate.
• According to this theory, Harry's father's name is wrong on his grave and his death certificate, but I have already explained that.  But Anna Tersuhow's mother's name should be Sara on her death certificate, as it is on Fanny's.  But when Anna died, who was left who knew that?  Her husband precdeceased her by many years.  The only living sibling was Olga, who was in her eighties and not well.  (Perhaps not lucid.)  Anna's mother is listed on her death certificate as Bluma because no one knew otherwise!
• Who was Harry's father?  More theory.  There are two births listed for Bluhme Bernstein in Skalat.  One is Moses Hersch in 1878.  No father is listed in the index, but there may be one on the record itself.  This could be Harry.  The other birth to Bluhme Bernstein is Zalman Hillel in 1876 and the father is Judel Mendil Werfel.  This child died eight months later, where he is listed as Salamon Hillel and the father as Juda Mendel.  I suggest that Juda Mendel Werfel is Harry's father.  (We find no record of either Juda Mendel's death nor of David's birth, but they may have lived elsewhere during that time.)  Interesting that if this is the case, Harry is actually Moses Hersch, which is the same as the father of Bernard, Harry's uncle/step-father.  I don't assume that this is significant for these names are common, but who knows! We have now seen the two birth records.  The one for Zalman Hillel identifies the mother as Bluhme, daughter of Markus Bernstein, which fits the theory.  The one for Moses Hersch has the mother as Bluhme, daughter of Markus and Rachel Bernstein - with no mention of the newborn's father.  This is also OK, but it doesn't give us positive confirmation.

THERE IS NO WAY I AM GOING TO PUT ANY OF THIS INTO OUR DATABASE, WITHOUT MORE EVIDENCE.  (Perhaps the Skalat birth record of one of Bluma's sons will list Uncle Berisch Pikholz as a witness.)