Caught my bro at a 6 year olds birthday party! What to do next?

We're all at a family members 6th birthday and it's fun and everyone's having a good time at the park we booked. Soon it comes down to singing happy birthday and cutting the cake etc
My bro and his friend Seth were getting up to mischief and I guess were doing truth or dare thing and snuck off with some booze we had for later on (they are of age to drink but still)

So ofcoarse I had to go try and find them but kept disappearing , so left them for awhile cause i was getting annoyed and went back to the group. Later on my mom & sister asked where they were so I told them and we began looking for them yet again.

Then it became more embarrassing. They look on our faces must of been priceless, we just found them alone feeling each other up... just having a full out damn makeout session and touching each other all over.. oh you don't wanna know.

I just left them there but my mom and sister started questioning them and getting pissed at them for sneaking off from the party etc... lol it's pretty funny when I'm not the one in trouble but still like now what happens?
Caught my bro at a 6 year olds birthday party! What to do next?
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