Sorry to hear about your situation..
About your brother.. He's be able to fend for himself outside by now.. old enough to work that is.. but if his thinking is like what you described.. seems like he's beyond hope.
Regarding your father.. if you think positive.. perhaps he might gambling debts? when people feel remorseful about what they've caused/done, they'll try to repent, and to salvage the situation. However sometimes it's just not possible (ie. Financial Problems, etc.), and plans can backfire, thus he might really need his family's care and concern..
If you really intend to ask if he's got a family outside or anything hurtful/despairing.. I recommend you do it while the rest of your family are around.. it might be unsafe.. you know.. violent outbursts from parents are common nowadays..
Oh yeah, try to speak to him in a non-hostile sort of tone.. should ease up any rising tension..
Anyway, if you take this matter negatively.. you'll end up stressing yourself out and don't you think your mother is suffering silently, seeing you in this state?
Your brother and father are already upsetting her enough, guess it's up to you to keep her going and providing her with the will to live.. wouldn't want self-inflicted harm to befall her, would you?
Take care
*hope you understand my bad phrasing
Polar
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