<human>: Hey All!

(Firstly, I created a throwaway because I have close family that knows my normal account)

Basically, My grandfather created two UTMA accounts for my sister and myself in 1996. They now both have substantial value, but they are mutual fund based. My sister is over 21 so she does not have this issue, however I am 18. 

It is a Wells Fargo UTMA (Until 21) Account. Over the past two years the financial advisory for these accounts has been hard at work loosing money. He made some bad investments/trades/mutual fund choices and lost my account about $4500 in value in the month of December. And that's just 30 days, in 2014 he lost about 13.5k in account value. I was looking at the yearly financial report last month and I see consistently bad choices in addition to some other boring stuff.  

**Here is my question**  
I am 18 and I want to withdraw the funds, partially to help fund a business I am involved with, and the rest to put into my own account - where my adviser is actually making me money.
However, I was told my Wells Fargo that he locked the account from me until 21, but another rep told me that UTMAs unlock at 18.  
I spoke to a lawyer 2 weeks ago, and she is still looking into it. But is there any way to 'hostile takeover' the account? My parents both agree I should have the funds, but my grandfather (the custodian) is rather closed minded and unaware to the fact that he is being robbed blind.

Anyone know about this type of stuff? Legalities for taking a UTMA locked till 21 after the age of majority?  
Thanks Everyone, Sorry for the rather bulky text.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: My UTMA is 'Under Custodian control until 21' I am 18, do I have any recourse to take the funds?