Two family members in the hospital and that not even the biggest problem...?

There are six kids in my family. The oldest is 26 and the youngest is 17. We are not one big happy family. To start off the problems, our dad is so lazy that it is unbearable. He leaves food laying out, doesn't pick up after himself at all, eats ridiculous amounts which adds to his already horrible obesity, pes all the work onto us kids. He also shows 0 emotion about everything. My mom is not about to let someone disrespect her. Three of the six kids are highly disrespectful and there is heavy tension around my mom with them. She absorbs everyones problems and cares too much about them. Now onto each kid; the oldest is very short tempered and often the conflict creater; the next has anger problems for sure and adhd; the next is the calmest of us all and helps mediate mom through these problems; i am the fourth, i feel like i am doing everything to help relieve the pressure; the next sits in her room because she hates the stress of the family and has trouble having a good time with friends; and the last is a true piece of work, he is very disrepsectfuly to both mom and dad and all the other kids and he only is nice when he wants something such as using the car or carryout dinner. This is really separating the family and we don't know where to turn now. Currently the second sibling is suffering an injury in the hospital and all the stress and emotion has caused our mom to enter an anxiety center. I don't know what i can do. It is really taking a toll on everyone. Can anyone out there help at all?!