Legal analysis: the most serious consequence of forging a will signature is the loss of inheritance. A will refers to a legal act of disposing of a testator's estate or other affairs within the scope permitted by law before his life, which takes effect when the testator dies. A will is an expression of the testator's true meaning. If an heir forges a will, if the circumstances are serious, he will lose his right of inheritance.

Legal basis: Article 125 of the Civil Code of People's Republic of China (PRC). An heir who commits one of the following acts shall lose the right of inheritance:

(1) Intentionally killing the decedent;

(2) Killing other heirs in order to compete for the right of inheritance;

(3) Abandoning the decedent or maltreating the decedent if the circumstances are serious;

(4) Forging, tampering, concealing or destroying a will, if the circumstances are serious;

(5) forcing or obstructing the decedent to establish, change or withdraw his will by means of fraud or coercion, and the circumstances are serious.

If the heir has committed the acts mentioned in Items 3 to 5 of the preceding paragraph, and indeed shows repentance, and the decedent later expresses forgiveness or is listed as an heir in his will, the heir shall not lose his inheritance right. If the legatee commits the act specified in the first paragraph of this article, he shall lose the right to be bequeathed.