According to Sziget Marriage Register #283, the father of Mendel Kahan from Entredam was named Daniel. Chaim Leib Vider and Samuel Liberman were witnesses of his marriage to Zlatta Perl, daughter of Salamon, at the bride's home on 7 Oct 1883. Both Mendel and Zlatta were widowed. Mendel's father Daniel died in Sziget in Mar 1887 at the age of about 81. Daniel was probably a widower when he married Niszel who had been previously married to Burek Grun. She died in Dec 1880 according to Sziget Death Register #290. Chananya Kahana, son of Shmuel Zanvil Kahana and Nissel Kahana, daughter of Kuntres haSfeikos, may have also had a son named Menachem Mendel but I think you may have their trees tangled.
Vivian Kahn