Parable of the Lost Son
Takes his share of the money, party, party,party, less money, eat with the pigs and treated like servant. Then decides to go back to his Dad as he is not worthy, Dad is happy and throws party. Older son is cross as he didn't get a party. Dad says to him, he was lost but is now found, you have never been lost.
Sin
Spends money, doesn't think about it, moves away from God, denounces his father
forgiveness
Father/ God is always there ready to forgive and welcome you.
the older son is a good catholic who does everything good, Father is God and the younger son is a sinful man who has repented.