How can an NRI respond to injunction order

I purchased a land of 6 cents out of 10 cents (one survey number) from a Hindu undivided family. The property completed registration by regular sale deed with all the family numbers (property owner and his both sons and both daughters).Later on i received a I.A notice from court.we came to know that one of the property owner son made an early sale agreement (for 6 cents) with other party and he received an advance but he failed to complete regular sale deed, so court issued an injunction order and I.A notice for me to attend and raise concerns above property. Due to I am staying abroad my family numbers refused to take notice, so please advise me how to overcome from this issue.