In fact, Rema didn't marry 3 Wives, Shprintza- his 3# wife, wasn't even married to him at all. The Sheerit Yosef and Rema Were Brothers-in-law 'cause they married Rabbi Moshe Eberles daughters. http://www.hebrewbooks.org/pdfpager.aspx?req=46421&st=&pgnu...