Having followed Jo for a number of years (no longer but dip in & out) their relationship has always been very close, its weird but they probably are just extremely close, their parents divorced so who knows how they actually grew up? Or what they went through.
I can't stand the brother though, he just grates on me, such a lay about, was chat on the thread he has addiction issues and think it shows.
He's a creep.
Tim has left so she now spends her free time with him, again chat before, was one of the reasons Tim left because of the brother?