From https://www.hebrewbooks.org/pdfpager.aspx?req=46421&st=&pgn..., we have that:
Rabbi Isaac Wolf Bunim-Meisels, of Vilna had a son Rabbi Moshe Ben Yitzhak HaCohen Bunems Meisels, Ba'al "Mahadura Batra", who was married to a daughter of the Shmuel Eliezer haLevi Eideles, MaHarSha.
The question I have is on this Sarah Meisels, another daughter of the Shmuel Eliezer haLevi Eideles, MaHarSha.
Geni has her as 2nd wife of Rabbi Isaac Wolf Bunim-Meisels, of Vilna, Rabbi Moshe Ben Yitzhak HaCohen Bunems Meisels, Ba'al "Mahadura Batra"'s father. Is there a source for this?
This would mean that R' Moshe married the sister of his father's wife.