Undue influence is any act of persuasion that overcomes the judgment and free will of another person. It can include such things as deception, flattery, begging, trickery, insinuations and other...
The effect of coercion is that It makes the contract voidable at the option of the party's whose consent is obtained by coercion The effect of undue influence is that it makes the contract voidable...
Factors such as undue influence and fraud can have a HUGE effect on a will. More specifically if either of those elements are proved then it can serve to invalidate that portion relation to the undue...