The Kinks - Have a Cuppa Tea "Granny's always ravin' and rantin'..." "Grandpappy's never late for his dinner..." "Take Granny's stand-by potion"
Son of a Son of a Sailor -- Jimmy Buffett Silent House -- Dixie Chicks. Those are the only 2 that came to mind.
There's that Alabama song that mentions music that Grandma and Grandpa used to play. Got both sides covered there!
Older Than Grandpa - Black Oak Arkansas Contains the classic line "Even the time when the toilet froze."