F. Murray Abraham originally appeared as a different character in season 2 as a husband of a woman Louis is picked up by and propositioned to have a threesome with. Louis C.K. is well-known for his intentional lack of continuity with actors/characters on the show.
C.K.'s paternal grandfather, Dr. Geza Székely Schweiger, was a surgeon. Székely Schweiger was a Hungarian Jew whose family emigrated to Mexico, where he met C.K.'s paternal grandmother, Rosario Sánchez Morales.[18] Sánchez Morales was a Catholic Mexican of Spanish and Indigenous Mexican ancestry, whose European-born family had been in Mexico since the mid-1800s.[19] C.K.'s grandfather agreed to have his children raised Catholic, but was (according to C.K.) "quietly Jewish."[20] C.K.'s father converted from Catholicism later in life; he remarried a Jewish woman, converted to Judaism, and is an Orthodox Jew. C.K. has said that his father's whole family still lives in Mexico.
C.K.'s real paternal uncle, Dr. Francisco Székely, is an academic and an international consultant on environmental affairs who served as Mexico's Deputy Minister of Environment (2000-2003).