Looking for info on great great grandfather

His brother, Patrick b. 1806, Parish of Moore, Roscommon, Ireland  d. Dec. 3, 1888 Guys Intervale, Guys. Co. NS Canada.  Patrick came to Canada in 1824, 18 years old and m. Elizabeth "Isabel" Margaret Murphy of Bayfield, NS Canada.  Did our relative, his brother John cross with him and where did he arrive?  Was he born in the Parish of Moore and when?  What were their parent's and siblings names?  John m. Catherine (Christin) Eliz Ehler.