At cocktail time, it is inappropriate. I would think that if a child isn't permitted to roam about a bar, then the same would hold true for a hotel lounge if there is a bartender.
Alcohol and children don't mix. It's a bad environment for children anyway. I'm not talking about rights and I'm sure the laws in each state vary. I'm talking about what I deem is appropriate. It's my opinion and who knows, maybe it's mine alone.