No. Each person's circumstances and the relevant dependent requirements must be assessed. Shared business participation does not make two households legally identical.
Keep applicant and family records separate
List who intends to apply through which principal and what each person plans to do. Qualifying spouse work rules do not automatically extend to children. Do not infer one family's outcome from advice given about the other partner.
Create one chart identifying each principal investor, spouse, and unmarried child under 21, then attach citizenship, relationship, and intended-activity records to the correct person. The enterprise needs at least 50% ownership by treaty nationals, while each principal investor must hold treaty nationality and develop and direct the enterprise; one partner’s approval does not decide the other’s case. A spouse has employment authorization incident to valid E-2 status, but should preserve appropriate admission evidence for an employer. Decide which family is tied to which principal and sequence travel accordingly. Identical share percentages do not erase differences in citizenship, relationships, ages, or immigration histories.
Hypothetical example: Two London entrepreneurs form a mobile pet-grooming venture, one as a Canadian citizen and the other as a Canadian permanent resident who holds another nationality. Each owns half and has a spouse and child. They document the company’s treaty ownership and assess the second partner’s treaty eligibility under the citizenship actually held rather than the PR card. The Canadian principal’s spouse plans employment only after receiving valid E-2S documentation. Each household keeps separate civil records and travel plans instead of copying the other’s result.