The phrase "wayward brother" refers to a sibling who often behaves in a rebellious or unpredictable manner and does not follow societal norms or rules. Full definition
Dean Martin as The Duke's brother?!? Admit it... it's not the first casting choice anyone would make, but Dino finds his way in this tale of 4 wayward brothers who come home to try to make things right by Ma even if it kills them. (rottentomatoes.com)
He resented having his wayward brother honored in this way. (religion-online.org)
After briefly summarizing the Parable of the Prodigal Son and looking at one false idea I used to hold about this parable, this post provides four ideas to help those of us who feel like the older son to recognize that when our father throws a party for our wayward brother, we are not the ones who are getting cheated. (redeeminggod.com)