My family is having mortgage problems?

My mother is 51 years old (goind on 52) and my grandmother is 80 (going on 81). I am 16 years old and my brother is 19 years old (going on 20) and we are bother currently unemployed and he is in college and i attend in a public high school. My mother works in a casino and isnt making much money, only about $1,200 a month, and my grandmother only get $1,000 a month from when she retired. My mom pays for the mortgage witch is $1,800 a month, it use to be $1,200 but they raised our mortgage and my grandmother pays for the bills and food and part of the mortgage. They can’t afford to pay the mortgage anymore so now they have stopped paying the mortgage. They have contacted the bank to try and lower it but they refuse to help us even after obamas speech. We had other people try and help us too but everyone says that $1,800 is really low. By the way our how is worth $200,000 about, it use to be $150,000 around there when we first moved in. We heard of Obamas plan for housing and we still are unsure if we qualify and we arent sure what to do. Can anyone suggest any help to us? And can somone please explain Obamas plan to me so I can understand because im getting different stories about it. Thank you so much in advanced.