#names

I would like some help in understanding the Patronymics in this marriage record from Bialystok 1892.

SZEJN, Mordchel Aronowicz Jankelewicz  married WAJNER Freida Dwora Gerszowna.

Do the two names show the father and grandfather, of Mordchel?

Is Freida the daughter of Dwora, and daughter of Gerszow? Or is it Freida Dwora, daughter of Gerszow?

Thank you in advance,

Rene Eisner

Melbourne, Vic, Australia.