A more thorough explanation:

A will contest is a legal process where people argue about whether a will is valid or not. This usually happens after someone dies and their will is being probated. The most common reasons for disputing a will are:

• Someone close to the person who died influenced them too much when they made the will
• The person who made the will was forced to do it
• The will was changed or cancelled before the person died
• The person who made the will didn't understand what they were doing when they signed it
• The will wasn't signed or witnessed properly
• The will was made using fraud or deceit

In order to start a will contest, you have to be someone who has a stake in the will. This means you have to be someone who will be affected by the will being probated. For example, if you were left out of the will, you might want to contest it. In California, anyone who has an interest in the will can start a probate proceeding by filing a petition with the court.

For example, let's say that John died and left a will that gave all of his money to his sister, Jane. John's children might want to contest the will because they think that Jane influenced John too much when he made the will. They would have to file a petition with the court to start the probate process and argue their case.

It's important to remember that in a will contest, the court is only deciding whether the will is valid or not. They are not deciding what the will means or who should get what. That comes later in the probate process.