Age will not come into it, you really need to ask the Solicitor, who will have followed the law, if the other parties have a Right to any share and explain how. As Woofgang said if you are the only direct heir, you will have to sign a Deed of Variation before the Solicitor can pass on any of the Estate.
If you put your Instructions in writing to divide the Estate, he will complete the Administration and then act on your written instructions. You may still have time to revoke these.
If you know how they were related to the deceased you will probably be able to work it out from the flow chart.