Probate is the process of proving the Will, so the process itself is technically a challenge. However, there are only three valid challenges:
- If there is a more recent, valid Will.
- If the Will was forged (this is very hard to prove.)
- If the person who signed the Will was not in their full mental capacity, or if they were coerced and under duress when the Will was signed (this is also very hard to prove.)