This is the story of my sister’s life!
“The boy” was no good, not this, and not that. She got married anyway. Dad was like 
until the day he held his grandson in his arms. It was love at first sight - he can’t live without his grandson anymore, and according to him, his grandson is the smartest grandchild in the world and the cutest. 
“The Boy-who-wasn’t-good-for-the-daughter” is now Guest of Honour at our place. 
You’re right - makes a world of a difference when babies get into the pic.