Court passed decree against us what action can I take

I am hindu five brothers, 2 sisters 1 married another unmarried. My grandfather died in February 2002, father died in December2005. My Buaaa/aunty has got decreed 1/4 share of ancestral property by Title Suit of 2011 in November 2013 which could be known to us only tomorrow i.e. 5-5-16 by stating that she is karta of my mother died on November2012 and us which is completely wrong statement. The court stated in his order that they have not only served summons/ notices also published in local newspaper, but we could not received or traced or know about these and ordered onsided. Advice actions