Is it permissible for the woman's guardian to delegate the husband's brother or the husband himself to perform the marriage contract, and what is the form of offer and acceptance in this case, and is justice (adalah) a condition for the guardian's agent?

It is permissible for the woman's guardian to delegate someone else to perform the marriage proposal, provided that the代理 (agent) is qualified for marriage guardianship. It is also permissible for the husband to be delegated to perform the proposal for himself, according to most scholars. In this case, it suffices for the husband to say: "I have married so-and-so."