How do I find an elder lawyer for mass?

my brother refuses to give me or let me see any of my others legal papers-
i was her poa for health-13 year-we lived close- in nyc- brother lives 4 hrs away,moved her into a nh near him- removed and closed her/ourapt-of 55 yrs and never includedme-c
my brother said she took my name off as poa- i dont think she did this knowing what it means-he closed her apt- never told me or includedme-until the apt was gone-
i have called her lawyer to ask for explation of the change of poa and to see the new poa- and to see her will, any legal papers-he refuses-
my brother took her to mass. i am nolonger includedin her med care-
i had the most knowledge of her health- and yet he locked me out- he has some issues-
this is makeing me so sick-and it has deprived mom of helpful info when she was moved- he doesnt act as her advocate-he is happy she is in the nh care-he doesnt spend the time with her he claied he would- and none of her many friends can see her beause it is 4 hours away- he isolated her-from me and i was her advocate-
i have many issues about the NHomes care-
i need some legal advise'
can anyone refer me to a lawyer or an agency that canhelp?
please , this is becoming a very damaging situation-
thank you