C.K. was born on September 12, 1967, in Washington, D.C.,[1][10][11][12] the son of Mary Louise Székely (née Davis), a software engineer, and Luis Székely, an economist.[10] C.K.'s parents met at Harvard University, where his mother was completing her degree in a summer-school program.[13] They were married at St. Francis Church in Traverse City, Michigan.[14] C.K. has three sisters.[15]

C.K.'s paternal grandfather, Dr. Géza Székely Schweiger, was a surgeon. Székely Schweiger was a Hungarian Jew whose family immigrated to Mexico, where he met C.K.'s paternal grandmother, Rosario Sánchez Morales.[16] Sánchez Morales was a Catholic Mexican.[17] C.K.'s grandfather agreed to have his children raised Catholic, but was (according to C.K.) "quietly Jewish".[18] C.K.'s mother, an American with Irish ancestry, grew up on a farm in Michigan.[19][20] She graduated from Owosso High School in Owosso, Michigan. She attended University of Michigan and graduated from Ohio State University...