A treaty investor's spouse is employment-authorized incident to status and may work for any employer, including the family's own enterprise. Unmarried children under 21 hold derivative status and may study but not work. None of this leads anywhere permanent, because the route offers no direct path to permanent residence.
Generous while it lasts, and it does not become residence
Hypothetical example: Rachid would move with a spouse and school-age children while the laundry business he is buying finds its feet. The immediate position is comfortable. Rachid's spouse may take employment without a separate work permit, which for many households is what makes the arithmetic of the move work at all, and the children may enrol in school.
What deserves attention is the horizon. The status is renewable in principle for as long as the enterprise continues to qualify, and families live in it for many years, but it remains temporary in character, requires a continuing intention to depart when it ends, and does not itself convert into permanent residence. Two consequences follow for planning.
A child who reaches 21 loses derivative status and needs an independent basis to remain, most often a student route, and the family should count backwards from that birthday. And if the household's real goal is to settle permanently, the permanent route has to be built alongside this one rather than assumed to grow out of it.