My mother recently passed away. My sister was appointed Executrix and trustee of her will. We have not seen any documentation from her in 15 years. We have asked on numerous occasions to provide us with full accounting, assets and liabilities but to no avail. She is now delaying the distribution of funds and has informed us that she is helping herself to a commission, but as she was also named as a beneficiary she is not authorised to do so as there is no provision in the Will conveying the inclusion of commission and charging. I believe it is against wills and estate planning law to simply take whatever she likes without me and my brother agreeing to this. What can we do?