I noticed over on the Costa Rica Blog one of the top search phrases was "how to deal with mooching family". This was apparently from an expat interview of some idiot Chuck Dimbleweed who was explaining how he ran off to Costa Rica to avoid his mooching family.He could have stayed home and fixed his mooching family with creative use of fun foods. For example, everyone assumes that at a Korean Restaurant they always used the dogs and cats from the neighborhood (yeah, its a good story, but it is not true).
Many also believe that Chinese food restaurants make rats that they serve as chicken. Again, its certainly not true but a great story.
This of course leads the way to how you deal your mouching family. I assume besides money they mouch food. Hire your most disgusting friend to prepare some food out of rats, cats and dogs. Leave it out for your mouching family.
After they eat a bunch of it show the video of how it was prepared. It's doubtful they will ever speak to you again, much less mouch anything.
Remember, it tastes like chicken.