What is a common reason for contesting a will?

A common reason for contesting a will is claims of undue influence or lack of capacity. This basis stems from concerns about the testator's mental state or the circumstances surrounding the creation of the will. When individuals argue that someone exerted undue influence over the testator, they are suggesting that the testator was coerced or manipulated into making decisions that do not reflect their true wishes.

Additionally, the argument of lack of capacity hinges on whether the testator possessed the required mental competence to understand the nature and consequences of making a will at the time it was created. If a contesting party can demonstrate that either undue influence or lack of capacity was present, the validity of the will can be challenged successfully.

The other answers, while they may pertain to general estate planning concerns or interpersonal disputes, do not directly relate to common legal grounds for contesting a will. A valid living will addresses healthcare decisions rather than testamentary intentions. Disagreement among friends lacks substantive legal standing in matters of will validity. Furthermore, unusual property valuation, while it might raise issues regarding the equitable distribution of assets, does not by itself legislate reasons to contest the will's validity in a legal context.