Searching for descendants of Charles Cowan, father John, mother was Fanny Weir

Hi,  my great grandfather Charles Cowan left Ireland about 1885 and settled on Staten Island in N.Y.C.  He was from the Townland of Legaginny; had sisters, Jennie, Elizabeth, Margaret, Fanny, Isabella, and Hannah.  Isabella who was born in 1865 was the only child not to come to the U.S.  I would be absolutely over the moon to learn that I have relatives in Ireland.  Charles' mother was Fanny Weir who was from the Townland of Lackan Lower and her father was Thomas Weir.  I do not know her mother's name. I am also interested in learning anything about the family, County Cavan in the 1800's and earlier.  Thank you so much.  Here's hoping for a connection someday,  Fern Wilcox in Minnesota, USA