how would you react

[Mike Javi Cooper]

Depends on what kind of beer they brought..

[Cuatro361]

Guess no father in law???

Let them have the drunken pool party! Grab the family and head home, but stop for some ice cream or a movie before home...

[kfd82]

Tell MIL that you expected a "family" function, not a drunken pool party...

I always thought drunken pool parties were family functions?!?

[Cuatro361]

Oh yeah Happy birthday to your wife... you did the right thing for her sake, cause it could have been a crappy night and morning if there was a fight !

[Lonestar63]

I think your over looking one very important fact.

Most drunks are freeloaders, and these guys brought their own beer...