I think your being very nice !!!! I do t give any free time at all. But once you do something nice people have a way of making you feel unreasonable when you won't go even further .... Tell her the rest of the families only get one week so they should consider them selves lucky you are willing to take another week unpaid because they couldn't make their marriage work!!! (Joking of course ) however I would tell her that they are already getting a deal and that's all you can afford.