grdma named my sister as the power of attorney. sister added a non relative as alternate against grdma wishes. grdma passed before amendment could be made. There is a will and sis is the excutor. she now says the family has to take her court even though the next of kin is my mother. what are my moms rights as well as my other siblings in relation to this matter? Does my sister by law has to show the family the contents of the will or can she just tell us whatever she wants us to know with no actual proof?