This song is featured in an episode of the BBCs The Royle Family, when Jim sings it to his son Anthony.
The last line of the song - which from what I can gather, is a moral tale about not having to have money to be a millionaire - goes something like...
'I have a son and he calls me dad. Say hello to a millionaire.'
I'm sure it's a traditional, but I can't find info onit anywhere.
Thanks.


