What is the name of your state? Pennsylvania

Can B sue the bank for negligence in this case--

1995 Bank passbook savings account A ITF (in trust for) B

2000 account changed by a power of attorney person (not
account owner) to A ITF C and D and E

2002 A dies ; Bank pays C, D and E


B wants to sue bank because:

-- Bank policy and Pennsylvania guidance says maximum two
beneficiaries on an ITF account; bank violated its own policy

-- An ITF account is a testementary substitute, meaning that the
only person who can change the beneficiaries is A ( not the
POA person)