My other sister goes to her in-laws on Halloween every year. Luckily Husband and I live close to her in-laws and it's not really a problem for her to stop by so we can see her kids.
Let me introduce you to a soccer goalie, a soccer player, and a soccer ball. My sister said the only rule was: no kicking the soccer ball.
Let me introduce you to a train conductor (and his Dad but of course his Dad wasn't dressed up)
Myla wanted in on the action this year and she went as Super Dog (ok fine, I didn't have a kid to dress up so I made my dog a cape, sue me)
Towards the end of the night nephew decided he wanted to hold Myla's leash. Luckily she's a pretty calm dog and we were able to drop the leash so he could walk her by himself for a little bit.