Looking for some help. My Great Great Great Grandfather John O'keefe was born 1790 Cork County Ireland. This is wHere I am stuck and not sure where to search next. He relocated in La Salle County IL Usa. I am unsure of his wifes name his children:

Mary O'keefe b-1830 –

Edward O'keefe b-1830 – Married Ellen Sheehan b-1834 –

Patrick O'keefe b-1821 – d-1907 Married Jane b-1838 – d-1928

Owen O'keefe b-1820 – Married Joanne (Judith??) b- 1821

My Great Great Grandfather Timothy O'keefe Birth 1822 in Cork County Ireland
Death 1 MAR 1897 in Peru, La Salle, Illinois, USA
Married to Mary Lyons Birth Feb 1833 in Ireland
Death 25 FEB 1907 in La Salle County, Illinois