Their three kids, all successful, agreed to a Sunday dinner in their honor.
*
"Happy Anniversary Mom and Dad," gushed son No. 1. 'Sorry I'm running late. I had an emergency at the hospital with a patient, you know how it is, and I didn't have time to get you a gift."

"Not to worry," said the father. "Important thing is we're all together today."
*
Son No. 2 arrived. "You and Mom look great, Dad. I just flew in from LA between depositions and didn't have time to shop for you."
*
"It's nothing," said the father. "We're glad you were able to come."
*
Just then the daughter arrived. "Hello and happy anniversary! Sorry, but my boss is sending me out of town and I was really busy packing so I didn't have time to get you anything."
*
After they had finished dessert, the father said:
"There's something your mother and I have wanted to tell you for a long time. You see, we were really poor, but we managed to send each of you to college. Through the years your mother and I knew we loved each other very much, but we just never found the time to get married."
*
The three children gasped and said, "WHAT? You mean we're bastards?"
*
"Yep", said the father. "Cheap ones, too . . ."*