who is the last mentioned wife?
She was the daughter of Prince Ivan.
Jewna
Jewna (, , literally, "young woman" in Lithuanian; died ca. 1344) was daughter of Prince Ivan 
what is family of gediminas? A group of family members of Gediminas, Grand Duke of Lithuania. what are its origins? Various theories have claimed that Gediminas was either his predecessor Grand Duke Vytenis' son, his brother, his cousin, or his hostler. what is the origin of this former mentioned predecessor? UNANSWERABLE what are its wives? The Bychowiec Chronicle mentions three wives: Vida, Olga , and Jewna.
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Jewna [SEP] Introduction
Jewna (, , literally, "young woman" in Lithuanian; died ca. 1344) was daughter of Prince Ivan of Polatsk and wife of Gediminas, the Grand Duke of Lithuania (1316–1341). She is mentioned in written sources only once – the "Bychowiec Chronicle", a late and unreliable source. Therefore, some historians cast a serious doubt on her existence, but modern reference works still widely cite her as the ancestress of the Gediminids dynasty. There are considerable doubts about how many wives Gediminas had. The "Bychowiec Chronicle" mentions three wives: Vida from Courland, Olga from Smolensk, and Jewna. Some modern historians suggest that Gediminas had two wives, one from local pagan nobles, and Jewna, an Orthodox.