Mentioned by Mudlark above. (Although this isn't quite what I'd call a drinking song.)

MOM AND DAD'S WALTZ
(Lefty Frizzell)
« © '51 Hill & Range Songs »

I'd walk for miles, cry or smile for my mama and daddy.
I want them, I want them to know
How I feel. My love is real for my mama and daddy.
I want them to know I love them so.

CHORUS: In my heart, joy tears start 'cause I'm happy,
And I pray every day for Mom and Pappy—and each night.
I'd walk for miles, cry or smile for my mama and daddy.
I want them to know I love them so.

I'd fight in wars, do all the chores for my mama and daddy.
I want them to live on till they're called.
I'd work and slave and never rave to my mama and daddy,
'Cause I know I owe them my all. CHORUS

[Recorded by Jim Croce, Iris DeMent, David Frizzell, Lefty Frizzell, Merle Haggard, George Jones, Jerry Lee Lewis, Willie Nelson, Patti Page, Ernest Tubb, Faron Young, and several others.]