Fathers' Day Dilemma

So what a guy to do?  My brother in law and his wife have planned a 
Christening Party for their new grandson along with a 21st birthday party 
for their youngest son.

My plans for the day included driving the BE a bit, watching F1 at Indy and 
piddlin about.  Of course my kids will be at the party.  I like my wife's 
family but as I get older I am less prone to do what others expect and more 
prone to do what I enjoy on weekends.

Should I go or should I stay.
Phil Nase
http://home.ptd.net/~nase