What's the difference between "family affair" and "family stuff"

I'll take one day leave for my family affair.

I'll take one day leave for my family stuff.

What's the different exactly? Or what situation is the best to use "affair", and "stuff" ?


Solution 1:

Stuff is very informal. You wouldn't use to to speak to the Queen.

Also, it's an all encompassing term, it could describe a party, a funeral, an intervention, etc. Whereas you probably wouldn't refer to a family funeral as a 'family affair'.