I am sorry for your situation but I am not sure that you can locate and access it because you really have no idea what type of fund it is and if you are even entitled to it at this point.  You say "living trust" but I am not sure that you are using the right term for your situation is correct and those type of funds can be revocable, meaning that your Father could end your being the beneficiary to the trust at any time.  There are so many options and they can be tailored in so many different ways.  If you were entitled to the fund at 18 and it is still in existence then I would seek help from an attorney who can put you in touch with an asset locating company who may be able to help.  Good luck.