As I remember (it's been a long time):

Hurrah! Hurrah! My father's gonna be hung!
Hurrah! Hurrah! That dirty, drunken bum!
For he was very mean to me when I was very young,
Hooray, hooray, hooray, they're hanging father!

CHORUS:
Don't cry, lady, I'll buy your goddamned violets,
Don't cry, lady, your pencils, too;
Don't cry, lady, take off those coloured glasses -
Hullo, mother, I knew it was you!

Hurrah! Hurrah! My uncle's gonna be shot!
Hurrah! Hurrah! That no-good, drunken sot!
For he was very free with me when I just a tot,
Hooray, hooray, hooray, they're shooting uncle!

Hurrah! Hurrah! My brother's gonna be destroyed!
Hurrah! Hurrah! That no-good anthropoid,
For he always used to try on me the things he read in Freud,
Hooray, hooray, hooray, they're wrecking brother!

Hurrah! Hurrah! My cousin's gonna be hurt!
Hurrah! Hurrah! That dirty sex pervert,
For he was very free with me when I was just a squirt,
Hooray, hooray, hooray, they're hurting cousin!^^^

Don't put any big bets on the absolute accuracy of this. Some of those lines might have migrated between verses. If you can get a better one, use it!