Registration of property

DEAR ADVOCATE, MY MOTHER PURCHASED A HOUSE PROPERTY FROM THE STATE HOUSING BOARD (ODISHA),THOUGH THE HOUSE IS ALLOTTED ON HER NAME,BUT THE REGISTRATION IS NOT DONE.IN THE MEAN TIME MY PARENTS BOTH EXPIRED SUCCEEDING FOUR CHILDREN,ONE OF THE FOUR LEGAL HEIRS IS IN FORCEFUL POSSESSION OF THE HOUSE AND NOT LETTING OTHERS ENTER THE HOUSE,NOT COMMING FOR THE REGISTRATION PROCESS ALSO,PLEASE SUGGEST US WHAT TO DO ?