No. A financial account and a qualifying family relationship are different evidence. A qualifying E spouse’s work benefit depends on valid status and appropriate evidence.
Separate transaction and immigration roles
Joint control of funds does not itself authorize work or residence. The dependent category is for a qualifying spouse or unmarried child under 21; each person needs valid status.
A spouse's ability to work is a separate question from the investor's ability to operate the enterprise, and a shared business plan does not automatically create identical permissions for everyone in the household. Do not confuse dependent permission with principal eligibility: investor and enterprise need treaty nationality, at least 50 percent treaty-national ownership, direction through ownership or operational control, and committed at-risk capital in a real, nonmarginal venture. Eligible spouses and unmarried children under twenty-one can be dependents once a principal case exists, but nothing about dependent planning is useful while the underlying enterprise question is unresolved. Families in that position usually look at whether the young adult has an independent basis, at a student route, or at whether an immigrant category should be started by somebody in the family long before the birthday arrives.