I will lay odds that this is "Grandmother's Old Rocking Chair" (sometimes shortened to "The Old Rocking Chair"), performed by the Irish Rovers.
GRANDMOTHER'S OLD ROCKING CHAIR
performed by the Irish Rovers (transcribed from linked YouTube video)
Well, I courted your old grandma, son, a long long time ago,
And I said that she was the fairest of them all;
And I told her that I loved her, and I wanted her for mine,
And I wrote it all along the factory wall.
Now she gave me six fine sons, and your father, he was one,
And she kept our home together, and of favorites she had none;
But the war, it cut the family down to less than half its size,
And I watched your grandma aging right before my very eyes.
She was bonny, she was fair, and we made a lovely pair;
I'd give all the world to see her in the old rocking chair.
Now an angel called on us one night, to take your gran away,
And I just had time to comb and plait her hair;
And in the lonely times that face me, and it nearly broke my heart,
Nobody else could fill that rocking chair.
So now I climb the stairs at night by the flicker of candle-light,
And I look upon my shadow on the wall;
And I can still remember when that shadow once was two,
And beside me stood the fairest of them all.
So now I lay me down to sleep, I pine for my sweet lass,
Oh, I wish that things were like they used to be;
And I hope your grandma hears my voice and tells the Lord above,
To send an angel down to call on me.