Sophia,

Found this on Ancestry.  Riva SHMERMAN's father is listed as Sam SHMERMAN.  Riva born Vilednick in 1914.
Social Security Applications and Claims Index

Name:	Riva Shmerman[Riva Samoilovna]
Gender:	Female
Race:	White
Birth Date:	19 Oct 1914
Birth Place:	Vilednick, Soviet Union
Death Date:	Oct 1989
Father:	Sam Shmerman
Mother:	Charlotte Crane
SSN:	386781459
Type of Claim:	Evidence other than birth record submitted; U.S. citizen or alien allowed to work.
Relationship of Signature:	Not signed, SSA prepared.
Notes:	04 Nov 1976: Name listed as RIVA SHMERMAN

And, in California, U.S., Death Index
Here the name of Riva's mother is different from that on The Soc. Sec. application.

Name:	Riva Shmerman [Riva Sherman]
Social Security #:	386781459
Gender:	Female
Birth Date:	19 Oct 1914
Birth Place:	Other Country
Death Date:	25 Oct 1989
Death Place:	Los Angeles
Mother's Maiden Name:	Kravetz
Father's Surname:	Sherman

Good luck in your search,

Sherri Bobish