Though house registration is in the name of brother, it was purchased by father from his earnings, at that time your brother was not also of major age. The house is now ancestral property. Brother cannot ask you to vacate the house as it belongs to father. The decree obtained in 1995 is out to limitation now, as it could have executed with 12 years of passing of decree. Without decree you have right to stay in house as you are staying there since birth from 1973. File a suit in civil Court seeking injunction against any attempts by brother to evict you.