Turned a groupie to an angel when she 8, 7, 6, 5

He ran out on his 7 kids, whom eventually each had 3 children, a few of those kids even had their own kids, and here he comes in and out of all their lives every 5-7 years, not remembering/knowing many of their names, expecting his everlasting, awkwardly long hugs to make up for lost time. He's ruined our lives. He's ruined my life. We don't even call him grandpa. I'm ashamed to be related to such a coward.