Looking for Great Grandfather Hanlon or OHanlon Info

My great grandfather Bernard John OHanlon or Bernard John Hanlon left his home in Bailieborough, Cavan, Ireland somtime in the 1800s (possibly 1888) for the USA.  He was not married at the time. In the 1900s he was living in Newark, NJ, USA and married Mary Frances Leonard (from Stony Point NY USA).  They had five children named Thomas, May (Mary), Margaret, Catherine and Helen and lived for a time in Newark, NJ, USA.  Catherine was my grandmother and she married James P. Gunshinan--they later changed the name to Gunshanan--they lived in Greenpoint, Brooklyn, NY, USA. Catherine died in 1985.  Catherine and James had four children--James, John, Marguerite and Helen.  Marguerite was my mother--she was born in Newark, NJ in 1927 and died in 2013.