From the Emirates Pilot Recruitment FAQ:

Family Travel

Single staff - Mother, Father, Brother, Sister. Married - Mother, Father, Brother, Sister, mother-in-law, father-in-law. Their annual entitlement is unlimited firm tickets (ID50%) and 2 x ID90% sub load ticket on Emirates. In addition, a wider range of relatives are entitled to a max. of 10 firm (ID50%) tickets per year. Your spouse and children up to age 21 (or 23 if in full time education) are entitled to unlimited concessional tickets.

Staff Travel

"Captains are eligible for Business Class travel with upgrade to First Class on a space available basis at the time of departure when traveling on Emirates services. First Officers are eligible for Economy Class travel with upgrade to Business Class on a space available basis at the time of departure when traveling on Emirates services. However children under 16 are not eligible for the upgrade."