Sorry to hear about those who are ill. Be sure to drink plenty of fluids and rest. Flu is nothing to fool around with. Once it gets a hold on you, it's tough to get rid of.
I haven't heard of green tea helping but it's liquid so certainly can't hurt. I'll try to remember that next time I'm ill.
I've only heard of taking equal parts of honey, whiskey and lemon for a bad chest cold. Mind you, if your already a heavy drinker, it won’t work but if you never touch the stuff (like me) it knocks it (and you) for a loop.