Meagher to Baltimore, Maryland, USA 1815

My ancestors, Patrick Meagher and wife Mary came to Baltimore, Maryland about 1815.  Patrick also came again with a five year old child J Meagher in 1820.  They had a daughter Margaret and son John with them born in Ireland and then had Joseph in Baltimore in 1813.  I believe the J Meagher was the John Meagher.  From looking at hundreds of parish records I believe Mary Corbett married Patrick in 1810, then they had John in 1811 and then Margaret in 1815. They also had a son Thomas.  Is anyone familiar with a Meagher family who married a Mary Corbett in 1810, started a family and then went to Baltimore, Maryland about 1815.