1 free Annual Leave Ticket per year for each immediate family member. For the first 3 years this has to be used to tavel back to your designated " Home", after that, anywhere on the network.
Economy upgradable to Business for F/Os, J upgradable to First for Captains, HOWEVER they will not upgrade children under 16 (bloody silly!!)
Apart from that, you can buy "CAT A" tickets which are standby and basically ID90 on any flight, or "Cat C" which are firm space but only a limited number are released (usually if they are confident the flight won't sell out, so you are PROBABLY as well off with a Cat A!!).
Leave- you SHOULD get one block of 21 days "Peak Leave (Christmas and Summer) once every two years (standing by for stories from people you didn't- SEEMS most do these days), the rest of the 42 days is reasonably available at any other time, though it varies with fleet and requirements at the time.
Hope that helps!!