After the Mo Brothers' mother Mo 3 Leung was killed by Lee Mok Sau, and their father Mo 3 Tung abandoned them in mad grief, the brothers were adopted by Gwok Jing and Wong Yung and raised by the couple at Peach Blossom Island. The Gwoks raised them well, but why didn't they try to locate the boys' father instead? Mo 3 Tung was an old friend of theirs, after all, so wouldn't they try to reunite the man with his sons?