Legal analysis: According to the relevant regulations of our country, if the wife asks her husband to sign the contract, or the wife agrees her husband to sign the contract, the signed contract is valid. The trustee must handle the matters entrusted by the principal in accordance with the instructions and requirements of the principal. In the process of handling the affairs entrusted by the principal, the principal must complete the entrusted tasks according to the instructions and requirements of the principal. However, the entrusted matters shall not violate relevant laws and regulations or have specific personal attributes.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 503 Where an unauthorized agent enters into a contract in the name of the principal, and the principal has started to perform the contractual obligations or accepted the performance of the other party, it shall be deemed as ratification of the contract.

Article 504 A contract concluded by the legal representative of a legal person or the person in charge of an unincorporated organization exceeds its authority, unless the other party knows or should know that it has exceeded its authority, the representative's behavior is valid, and the contract concluded is valid for the legal person or unincorporated organization.

Article 505 The validity of a contract concluded by the parties beyond the scope of business shall be determined in accordance with Section 3 of Chapter VI of Part I of this Law and the relevant provisions of this Chapter, and the contract shall not be deemed invalid because it exceeds the scope of business.