After the expiry of my father in the year 2000, my mother applied for legal heir certificate omitting 2 of the 9 children and obtained legal heir certificate with only 7 children and self. In 2010, the omitted two female children along with another 4 female children had issued separate a power of attorny to the mother to represent them in a civil partition suit filed by me. Whether the power of attorny given by the children not shwn as legal heirs is valid in the civil court?