No, although they are your guardians, they can't do that. Because you have reached the age of 18, if you don't sign it yourself, the contract will be considered invalid. 18 years old is the minimum age for a person to have full capacity for civil conduct. But if you were below 18 when your parents bought insurance for you, the signature on the contract is valid and your parents can sign it for you. The signature column of the insured must be signed with the name of the father or mother. Please calculate the time when your parents buy insurance for you. Are you over 18?