A few thoughts...

In the house as a young kid, some Opera thing that always sounded to me like "Harley Double Vic and Vee an Treenia"

In the car on a journey, it might be.
When father painted the parlour
Mick McGilligan's Ball
Sweet Violets
I've Got Sixpence.

Also, at home, around the house.
A few from a John McCormack record, Oh The Days Of the Kerry Dancing, etc.

Annie Laurie
Flow Gently Sweet Afton
Vicar Of Bray

Tom Bowling
Drake's Drum
Old Bold Mate of Henry Morgan

At the moment, Jerusalem (Lift Up Your Gates and Sing) is popular.