What Scrooge's relationship with Fred?

Initially we see Scrooge as an oppressive employer who seeks to domineer Bob and treat him harshly. Then when seeing the visions of his own past and how Fezziwig treated him and his employees Scrooges attitude starts to change. And then in stave 5 we see Scrooge, the changed man soften toward Bob and raise his salary immediately plus seek to help Tiny Tim