They're moving Father's grave to build a sewer is a classic music hall song. The origin seems to be unknown but was revived by the Clancy Brothers. It was a favourite of Frank Muir's, well before the Brothers' time, who sang it many times on BBC Radio 4. It is usually sung in a straight key of C major, but can be varied.
Lyrics
Lyrics vary, but Muir's version is thus:
They're moving Father's grave to build a sewer
They're moving it regardless of expense.
They're taking his remains, to put in nine-inch drains
And provide the public with a nice new gent's.
It's such a lovely place behind the gasworks
With dandelions growing by the fence:
Now it seems a wicked plot
To spoil that lovely spot
Just for one old rich man's convenience.
References
They're moving Father's grave to build a sewer Wikipedia(Text) CC BY-SA