Orla's Da?

Pardon me if this has been discussed before. Do we ever find out who or where is Orla's Da? And is Gerry the sole supporter of the entire household? Granda Joe probably gets a pension. But Sarah doesn't seem to work. But tans on the regular, not to mention her hair, make up and clothing! Not cheap! They once mentioned about Mary calling in to work once, but never since? I've watched about 6 times.