This is a long shot, as the original post was such a long time ago but I have exactly the same on the birth record for my Gt Grandmother. It says Poorhouse Perth with Tibbermore in brackets beneath. Just wondering if you managed to get to the bottom of this little mystery at all?
I'd wondered if it meant that the baby was born at the Poorhouse in Perth but that the mother was from Tibbermore. I can't find any record of an annexe of the Poorhouse in Tibbermore itself; given its size, this seems unlikely.
It would be lovely to hear from you, thanks.
Chris