Genealogy / do i have family back in poland? [5]

question 1 my grand parents born here my great great grand parents migrated from poland but dont know were exactly
2 if there is they are in wisconson with my uncle and cousins
3 i thought i heard a story about my great grandpa having a sister and they have kids but they live here now wether or not there is family in poland is unknown cuz the only people that knew family was my great and great great grand parents long since deceased now