Where Sin Increased, Grace Increased All the More

We understand the father being glad the son returned home, but what father would give his son the best robe, a ring, shoes, and the huge celebration after living so rebelliously? The son didn't deserve any of this, but grace is when sinful people receive favor they don't deserve. Romans 5:20 says, "The law came in to increase the trespass, but where sin increased, grace increased all the more." The son's sin increased, but the Father's grace increased more.