My name is John Sarkis, and I live in St. Louis, MO, USA. I can't help regarding ancestors of this family, but have found records you might be interested in. As you noted, Kalel was wed 2-6-1902 at the Catholic Church, Annunciation of the Blessed Virgin Mary, known locally merely as - Annunciation. This parish closed in the mid-60's, and their original records are now housed at nearby St. Mary of Victories. They've also been microfilmed, and can be ordered from your local Family History Center. Should you want to look at the films, they're numbered FHLC # 1901955 & 1901956. If you want to order a copy of the marriage record from City Hall, it's recorded in Book 57, Page 361, License # 96201.
Other marriage records:
Shwan Isaac Shwan wed Marie Frances Wakad of Chicago at Annunciation on 11-11-1909. Bk 72, PG 220, License # 153302
Michael Schnaoui wed Adele Schwan 10-23-1920 at St. Anthony the Hermit Maronite Catholic Church. Bk 96, Pg 41, License # 243296
Edward Stockman wed Julia Schwan 7-30-1923 at St. John the Baptist.Mrs. Adele Schnaoui consents. Bk 103, Pg 70, License # 269747
Raymond B. Schwan wed Margarette Stetina on 8-3-1935 at St. Anthony of Padua. Julia Stockman, sister and guardian consents. Bk 125, Pg 316, License # 355324
I also have a copy of a photo of George Schwan (Jr.?) published in the St. Louis Post-Dispatch in 1944 among other war dead.