Isaw
Just like Stew said, absolute max is 8 days off. On your day off, you are not allowed to go out of town and the scheduler reserves the divine right to call you anytime if he needs to make you fly. You will be given extra compensation if asked to fly on your day off but you may not refuse. You may not turn off your cellphone. If the scheduler is unable to contact you, you will be deemed 'MA' or missed assignment and will have to serve a 3 day suspension on your first offense.
There is also a maximum of 2 successive days off to the roster so don't expect to be able to string your days off. The other thing that Stew mentioned about DH to cebu to fly the leg back just to avoid having to schedule excessive days off is also the norm. This is usually the case during lean months.
Regarding travel benefits for immediate family, each member is entitled 6 FOC RT tickets to any destination. However, there is no guarantee whatsoever that no bump off shall occur. Revenue is always priority. Even FDC on personal DH or FOC are not spared from being bumped off.
No discounts whatsoever apply on purchased tickets or with other airlines.