However, there is no ‘right’ to inherit from a person’s estate, no matter how you are related to the person who has died, and just because someone makes a claim against an estate does not necessarily mean that they will be successful.
The most important thing you can do to mitigate any sort of claim against your estate, is to make a Will, as this document clearly shows that you have thought about what you would like to happen to your estate upon your death. You can also leave a document with your Will, called a Letter of Wishes, which sets out your reasons for why you have left your Will as you have, and it gives your executors something to use against any claim.
If you do not make a Will, then there are certain rules that have to be followed, called the Intestacy Rules, which can be quite complex, and could mean that your estate ends up with people that you did not want to benefit.