Treat it as uncertain. If repayment can be triggered by delay or an early departure, spending it on relocation creates exposure the household may have to cover. Note also that a spouse in TD status may study but is not authorized to work.
Plan relocation costs without relying on the bonus
Households often earmark a signing bonus for a deposit, a move, or the gap before a first paycheque. If the agreement can require repayment, those funds are effectively borrowed. Build the relocation budget on savings that are not subject to a clawback, and keep reversible commitments, notice periods, leases, school enrolment, until the immigration position is settled and the first authorized start has actually happened.
A spouse and unmarried children under 21 may qualify for TD, through steps that differ by nationality, and TD permits study but does not authorize work of any kind, including remote work for a Canadian employer. TD dependants may study, but TD status does not authorize employment, whether the activity is paid, unpaid, remote, or labelled orientation. TD status follows the principal's TN and does not require the dependant to be a Canadian or Mexican citizen.
The spouse’s location and current status affect the available process.