Lyrics copied from http://www.rampantscotland.com/songs/blsongs_scotchmother.htm

OLD SCOTCH MOTHER MINE
Ray McKay and Joseph Maxwell

CHORUS: In an old Scottish home that is dear to my mind
Lives an old Scottish mother, so gentle and kind.
Trouble and care may have wrinkled her brow,
But with thoughts sweet and tender, I think of her now.

1. Old Scotch Mother Mine,
You are with me all the while,
Your kind old eyes
And your dear sweet smile. CHORUS

2. Tho' we're far apart,
For the sake of Auld Lang Syne -
God bless and keep you
Old Scotch Mother Mine. CHORUS

[There are several variant spellings:
OLD SCOTS MOTHER MINE – 159 hits on Google
OLD SCOTCH MOTHER MINE - 105
AULD SCOTS MOTHER MINE - 63
AULD SCOTCH MITHER MINE - 21
AULD SCOTS MITHER MINE - 19
OLD SCOTS MITHER MINE - 16
AULD SCOTCH MOTHER MINE - 9
AULD SCOTS MITHER O' MINE - 3
OLD SCOTCH MOTHER O' MINE - 1
Several of these refer to actual recordings.]