My husband's great-grandmother Maria Yanikova married Ondrej Rohacek and emigrated to the US prior to 1900. On her death certificate it shows her parents as Johan Yanik & Maria Halucisz. She was born in Stara Tura in 1868 and died in Steelton, Pennsylvania in 1911. She had a sister Helen who came to the US after her death to help care for her young children. I am wondering how to go about researching this family.