I couldn't find the birth record you mentioned, however I found information about Eleanor Dicerchio. In San Diego were 2 births by a female with the surname Dicherchio (an unusual name). These are Judith Ann Grace Garcia, b 16 Nov 1955 and Toni Marie Garcia 4 Sep 1954. I checked the marriage records and found: Anna M. Dicherchio, m 21 Nov 1953 in San Diego to Arthur J Garcia. There was also an Eleanor Rose Dicherchio b 5 Jul 1934 in San Diego, mother's maiden Cornelius. Anna Marie Dicerchio b 15 Sep 1932 San Diego, mother's maiden Cornelius.

Eleanor R Dicherchio b 29 Jun 1957 in San Diego married to Robert W. Rinder.

Robert W. Rinder presently lives in Bard, CA but I don't see him listed with Eleanor. I checked and they divorced on 25 Aug 1978. Eleanor R. Rinder married Robert C. Benthin 24 Feb 1979 in San Diego. Eleanor R. Benthin, age approximately 80 is presently living in San Diego and is associated with Annette Benthin and Robert Benthin, she sometimes goes by Ellie R. Benthin. An address found for Robert C. Benthin shows 6315 Lake Albano Ave, San Diego 92119 (not sure if it's him because no age is shown). Another listing for Eleanor Benthin just shows her in the 92119 zip code.

Call information for her number. She'll know about your niece's half brother.