2. As long as it does not violate laws and regulations and public interests, it is effective.
3. If the agreement is inherited by Jiang and his wife through consultation, it belongs to both husband and wife.
If there is something wrong with the house, for example, it is about to collapse, then everyone should bear the cost of maintenance and renovation; If several rooms are built privately next to the house (with legal approval), then the house belongs to Jiang, and the decoration cost is also borne by him; However, if it is the interior decoration of the house, the rest of the children do not need to bear it, but as far as inheritance is concerned, they may be properly taken care of (for example, give him some decoration, or as many as possible).