A will can be challenged if:

1. the will-maker did not have the testamentary capacity (ie they were not of sound mind) to make a will at the time it was signed;
2. the will-maker did not make the will freely, or thier decisions were influenced by others;
3. the will-maker had a responsibility to provide for someone but has not left them a fair share of the assets.

Any eligible person can challenge a Will in court. Of course if you intend to challenge a Will you need to talk to a lawyer first.

We may be able to help you find a lawyer.