It is unclear why Lewis made certain his five surviving children could not inherit his estate, and if the move was due to a personal grudge or simply because they are older than his adopted daughter Danielle, who is 25.Lewis was married to his first wife Palmer from 1944 until 1980.
Peter's legacy lives on, says Leo, in his family, which has grown and grown to make up almost 200 grandchildren and great grandchildren.
However, Sunday's occasion was one solely for the 13 siblings, celebrated at their family home, where Leo lives still.
At the time of his death he had not spoken to his father in 20 years, with Lewis refusing to even pay for his funeral.
He also allegedly asked Joseph's five brothers to keep his death quiet in hopes that the media would not find out about the overdose.
The parents tragically lost their youngest son Michael (25) in 1975 following a car accident, while Oliver passed away at age 64 after a battle with cancer.
Despite fathering 16 children, Leo's father Peter had been an only child, while his mother Ellen was one of 14.
We had to get some of them sent out again, and then the marriage certs for the girls who changed their names.
We had to have three referees back us up of course, to say we were who we said, including the local priest!
"After Austin died, it took a number of years off what we needed to make that record, but after 13 months we made it up again.