Trusts are contracts. You don't necessarily receive money when you are 21, you receive money when the trust says you do. You need to see the trust to see its terms. As a beneficiary you have the right to have information about the trust and the money in it. If you are not speaking to you grandfather you should hire an attorney to speak for you.
The contents of this answer should be considered friendly advice, not legal advice and the answer should not be construed to constitute an attorney-client relationship. If you'd like actual legal advice, call me at 954-567-4100. Also, if you liked this answer did, be sure to click the thumbs-up button
You are entitled to a copy of trust and accounting of assets.
The trust will outline the timeline of when you will receive your distribution.
If your grandfather is not following the instructions in trust-you might have a reason to petition
for his removal as trustee.
You will need an attorney to assist in getting your distribution and the records you are entitled.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.
You will need to know if this trust was created under a Last Will and Testament or by a Living Trust. If it was created under a Will the Will is a public document. You can go to the Probate Clerk in the County in which your grandmother died and get a copy of the Will and then determine if the Will controls the Trust. Otherwise, I recommend you consult an attorney to request the Trust disclosures that you are entitled to under the law.