Hello. Without the information I asked for, I can only give you a general answer, but I hope this helps. You can always come back to me for clarification if needed.
It looks as though you are estate planning here and you are right to do so.
If you want to protect income for someone and allow them to access this when they turn 25, then a trust is the means to do this.
Trusts are only effective if they are properly drafted, so you do need a solicitor to do this for you I'm afraid, but the investment is absolutely worthwhile.
The link here allows you to search locally for someone to assist: https://solicitors.lawsociety.org.uk/
This article also discusses how you make your will and control who has what when you pass: https://www.moneyadviceservice.org.uk/en/articles/planning-what-to-leave-in-your-will
I hope these resources assist.
Thank you again for visiting JustAnswer, please do let me know if you have any additional questions in the future. I am also happy to answer any new questions on other topics that you may have, you can request me by putting “for PLCLEGAL” at the start of the new thread. Best wishes, Peter