If a child is given POA and another child later throws accusations that the POA is not paying bills where does this lead?

Where does this other child
" throw" her/his accusations?

Are the bills being paid?

Does the non POA child have reason to believe bills are NOT being paid?

Bills are paid

Bills are paid always

I didn't share information with my siblings. That was my dad's wishes early on before the dementia really set in, and it would have only caused me more trouble anyway.