My brother placed my father in a foster home. How can I get him out?

My 88 yr old dad was placed in a "foster home" (by my older brother)a few weeks ago due to mom being hospitalized & no longer able to be his FT care giver. My dad is not happy and I do not feel he belongs in a "foster home" that is overcrowded and has little for him to do but sit in a chair all day. My brother insists that it is "better than a nursing home" and won't cost nearly as much and he is determined to keep dad there. Mom is distraut and frustrated, as I am. I want him out, but we do not have the 6000.00 the nursing home say's we will need up front. Can anyone give me some advice???