Solicitor has power of attorney. Now what?

There are 5 siblings and the youngest is pure evil. She arranged for her solicitor friend to have LPOA. After my father died as executor he bullied me. Our mother was in the same fabulous care home yet earlier this yr when mum went into hospital suffring a heart attack this siter cancelled the care home along with the help of the solicitor. All the social services could get from her was that it was a mis understanding. WHAT. we believe he is keeping this sister informed of all expenditures but not the 4 other siblings. mum has now been in hospital for 8 months and when we found a lovely home to take her this sister objected. So mum now remains homless.does the solicitor have to inform all siblings as mum has no capacity. Or can he choose just one, who is not the next of kin.