Grand Daughter Arrival, Praise the Lord

Your teacher always said in math, You wasn't very bright, As when you did your adding up, You never got it right. And though it appears so very sad, Twas teacher didn't know how to add, After all these years, to your delight, It's evident you are quite bright, You see your math was always right, For it happens just to be, That if you combine a loverly Lisa, With one fine looking fella, The product is an angel, A precious gift called Ella, So the moral of this story, And it was always meant to be, Is that teacher was so very wrong, As one and one makes three.