Succession /probate certificate

I would like to know my mother's brother's son filed a case for succession /probate on the basis of 'will' (for mother's younger sister who passed away 4 years back), that time my mother and other sisters oppose it, and the 'will' is rejected by court, and case shows disposed district civil court . after that he again appealed in higher court for succession /probate certi. against my mother only and its still going on. in this case if my mother wants to appeal for succession /probate as he already lost his case in civil district court, what should she does? she can file for succession/probate for herself only or if she gets certificate, benefits will be divided amongst all brothers and sisters. as other brother and sisters are not interested for any court case or to spend money for this. pl advice my mother can file in a district civil court for herself only for succession/probate certi....can she get a sarkari vakil being senior citizen as she got sarkari vakil in high court. She needs succession or probate certificate to claim all benefits like pf , gratuity, other amount from company and also her property? pl advice. thank you in advance.