P5,000 a month is enough, especially in the provinces. That much is a living wage out there. If you give more it only encourages dependency and they will never even try to do anything for themselves.
I firmly believe that you should try to equate it to being on the dole in this country without all the extras that many people in the UK get. If the government here gave you more than you need to live on and enough for luxuries as well while you were on the dole, you'd never even try to find a job.
As far as the extras/emergencies go, question everything and check them out as thoroughly as you can before you send more money. Just make sure you don't fall into an expectation "they ask, you send" relationship with them.
Iain.
Iain.