Guaranteeing the lease gives no work rights. Employment authorization for a spouse comes from holding qualifying E dependent status, which is generally work-authorized incident to that status and evidenced by the I-94 and applicable proof such as an E-2S notation. Each family member has a separate process and no shared guaranteed date.
Do not let a job offer depend on the guarantee
An offer may have a conditional start date; beginning work requires valid authorization. Check the spouse's E status and evidence, or another applicable independent authorization, then the employer's verification requirements. A guarantee and payments from a joint account do not create that permission. Unmarried children under 21 may qualify as dependents without work permission arising from that status.
Only a legally married spouse is a spouse for this purpose; an unmarried partner is not automatically included. The option or pending E-2 plan does not itself permit the spouse to begin working in the business. Children under 21 hold E-2 dependant status, may study, cannot work, and lose derivative status at 21, which needs a plan for a seasonal business that runs for years. Each family member’s intended activity, not the household’s convenience, decides what they need.