An Scéal

Hi, I'm trying to trace my Irish ancesters, my GGGrandfather Francis McVey married Margaret Clark June 1842 and they lived at 61 Chapel Street Airdrie...Francis is down as born in Co Tyrone 1819/22, His first Son Charles is down as born in Ireland 1843/45 in the 1861 Census Scotland,the rest of the family are all born in Airdrie,Calderbank and Coatbridge Dundyvan area. My GGrandfather Married Charles married Margaret McKeown/McEwen in Airdrie1865 according to the forms of the Free Church Of Ireland...so his wife was Irish too. My Grandfather Francis was Born in Coatbridge in 1873 and his Mother is down as McKeown.He Died in Glasgow where i was born in 1945. In his Army record he joined the Brittish Army in 1914 with the Royal Dublin Fusiliers at Nass Co Kildare aged 34. I am finding it very hard to track down the village/town in Tyrone where my ancesters came from. Though my Family were Prebytarians they must have been Catholic whilst in Ulster as they were Strongly Jacobites in their views, as i was often told by my own Father, that our Forefathers fough for for the Stuart cause, hence why the names Francis,Charles, Edward,run through the male line, any help with my quest would be greatfully appreciated.Kind Regards Ian.