Since Maxwell arrived at Islafub, his presence had been of tremendous help to both their fragile Nana Esther and Rex.
Maxwell practically turned himself to his mother's errand boy as he noticed that his Nana was becoming worn out since her dying son arrived.
If Maxwell wasn't by his mum, fixing some suspicious but important arrangements, he would either be by Marissa's side consoling her or by Rex's side, keeping him company.
If not for Maxwell's presence and continuous encouragement, Rex would have committed suicide than allow his wife or children to see him in his most vulnerable state.
