Partners that come along with you generally have the same access rights to the labourmarket as you have. Sometimes the employer or host institution can help or provide suggestions on how the partner could find a job.
Dual career services (services that assist partners of researchers with finding a job) are becoming more established in most Dutch Universities and Research institutions. Ask your HR department for avaible services and programmes.
The Netherlands holds a high percentage of part-time workers. Many Dutch parents choose to combine the household tasks and the workload by reducing their working hours. Employers are generally quite open to discuss a reduction in working hours.