There's also an Oak Hill Cemetery in Gary, Lake Co., Indiana but if your relatives were buried out of Prusiecki's then they are probably in the Hammond location. Both Oak Hills really went downhill. Volunteers have been really busy reviving the Hammond location now. When I visited the Gary cemetery in the mid70s I was knee deep in grass & weeds. They cleaned it up since but the sexton keeping the records for years was a disaster and many people went unrecorded. Many people buried from Prusieckis were interred in St. John-St. Joseph Diocesan Cemetery in Hammond if they were Catholics and in Elmwood Cemetery if they were not.