A will is a civil act in which the testator disposes of personal property, so he can only dispose of personal legal property. If the testator disposes of the property owned by the state, the collective or others by will, that part of the will shall be deemed invalid.
According to the above spirit, if the house belongs to Lao Wang, the second child's behavior of changing the house is invalid, and the house is executed according to the will. On the contrary, the will is invalid.