01/06/2026
Did you know there are five legal grounds on which you can contest a sibling's will in the UK?
If you have concerns about how your sibling's will was made, the law may be on your side. Whether you believe they were pressured into making it, didn't have the mental capacity to understand what they were signing, or that the will wasn't properly witnessed, there may be grounds to challenge its validity.
The five grounds are:
✅ Undue influence
✅ Lack of mental capacity
✅ Lack of valid ex*****on
✅ Fraud
✅ Want of knowledge and approval
Each one has different requirements and needs different evidence to succeed. And if a challenge is successful, the will can be declared invalid entirely.
Not sure if you have a case? Read our full guide to find out what each ground means and whether your situation might qualify. (link in the bio)