Are you the next of kin of someone who is no longer able to deal with their personal and financial affairs due to mental incapacity?
If this is the case, and they have not made a Will, or their financial circumstances have changed since they last made one, then you may be able to write or change one on their behalf.
You may even be able to challenge an existing Will if you believe the person was not of sound mind when they made it, as any such document they draw up in that state will be invalid.
The laws governing mental capacity and wills are complex. With this in mind, it is strongly advisable you seek advice from specialist family lawyers, like ours.