Hello. I have been researching my family tree for months now and have managed to go way back down different branches. However, my maternal grandmother's branch seems to be impossible to find after my 2nd great grandparents. All I have for them is a marriage certificate, which I've attached. Their names were Thomas McGuire & Catherine Mulligan and they were married in Belfast in 1876. Both have their father's names on the certificate. I know that at some point they moved to Glasgow where they had Francis John McGuire, my great grandfather. But I can't seem to find any information on the parents of Thomas & Catherine other than their father's names. I've tried searching Irish Ancestry records but can't seem to find much. All very confusing. Can anyone help? Thanks.