I love Halloween. When our kids were home we went all out decorating. Always give out "good" candy. It's a fun holiday, anyone(including parents) that dress up get candy from us. Kids need to be able to just be kids and have fun, without people making an issue of everything
As far as the ones with the "extra" bag for a sick sibling-we just smile and tell then they'll have to share theirs. (I had my own kids sick on Halloween more than once. And yes, our other kids were expected to share their bounty)