Jonas Šleževičius

Jonas' father was Simonas Šleževičius (Šilževičius) and his mother was Ieva Lukoševičiūtė.  His paternal grandparents are Motiejus Šleževičius and Marija; his maternal grandfather was Jonas Lukoševičius and his maternal grandmother is Agnieška Žemaitaitė. He had five sisters named Marijona, Domicelė, Ona, Rozalija and Agnieška.  He was the third oldest of the six children.