Some beers carb quicker than others. Maybe shake them up and keep someplace warm for a while-that's helped me.
NOT if you want them for Sunday I wouldn't shake them...Unless it's a heff, I don't think you want to serve your family cloudy beer...
I wouldn't rouse the yeast if you want them to be clear in 48 hours
What style of beer is it?
You really can't speed up carbonation...it is a natural process that has it's own agenda. If it has been 2 weeks, depending on the style of the beer, you are getting close....but not there yet.
Don't forget you need to chill them before you serve them (Ideally you want at least 48 hours, though a week is beter) But they should at least chill for 24 hours,...That means they need to be carbed by tomorrow...
And that's not even considering the idea of the beer still being "green tasting."
If this is the first time you're serving homebrew to your family/friends? I hate to dissapoint you, but I personally wouldn't...You want your family judging your efforts on beer that's not really ready?
I would check them tomorrow night, if it's carbed, then chill them and serve, warning your friends that it is still young...But if it's not carbed by tomorrow night...then I'd buy some good beer instead, and give them a raincheck.