McPhun

My name is Ann Kennedy (nee McPhun) a descendant of William Henry McPhun,he had a sister Elisabeth (Rose)McPhun who married Robert Grigg 3/6/1822 St James Church,Dublin. I have the documentation on this marriage & it is the only factual information I have on this brother & sister. I would like to know if they were born in Ireland & who their parents were? We were always told the family came from Strachur,Scotland. But it could have been the earlier generations.Hoping some one can shed some light on this,I have had no luck researching on the internet from New Zealand.Many thanks in anticipation annkennedy@xtra.co.nz