How do i obtain information about money i have in a trust fund?

When i was 3 or 4 i was in a car accident with my 2 sisters, mom and dad. all i know is that when i turn 18 i could get notarized to get the money. I am on my own with only money to get by so hiring someone to help is not really an option. I need to do this on my own due to previous disputes with parents and family, which leaves me with no information on the situation. I know it was in Texas, a long time ago thats about it. Having this chunk of money would help me out with a vehicle to get to work and some living expenses. I have no clue where to even begin, so if anyone out there knows anything please help! god bless.