No. The applicable relationship and individual eligibility must be established. A qualifying spouse and unmarried children under 21 may seek derivative status, subject to applicable age rules. Establish each person's own dates alongside the relationship evidence. A derivative's eligibility is assessed at points in the process rather than continuously, and a child's position can change with the passage of time in a way a spouse's does not, which makes the calendar part of the analysis rather than an administrative afterthought.
Use the relationship evidence for its actual purpose
Different surnames do not alone defeat a qualifying relationship, and identical surnames do not prove one. Collect the required civil records and explain relevant changes without assuming an investment account’s contact name settles family eligibility. Ask early which civil documents will be needed and where they are issued, since the office holding a foreign birth or marriage record works to its own schedule and will not accelerate for a filing date.
Where a name changed after those records were created, obtain the instrument that effected the change and keep it with them rather than filing it apart. Derivative status also carries the principal's later obligations: the period of conditional residence and the filing to remove conditions reach the family too, so a household should know when that window falls before it arrives. Set those dates once, at the outset, and revisit them whenever the principal's dates move.