Can a Personal Representative and Trustee also be the financial advisor for a beneficiary of the Trust?

Are you asking if it would in any way be a conflict?  There are potential conflicts in any situation where those that hold a fiduciary position take on more than one "job" so to speak.  But as long as there is full disclosure as t the duties they hold in their fiduciary capacity and no conflict of interest it could potentially be fine.  I would err against it though.  Good luck.