I have the tutorial turned on, and one of my villagers fell sick. I dragged a child onto him, and got the tutorial message "nice try, but children don't work..." Then I got a second message "your villager is still sick. Drag the same villager onto the sick villager..."

I think since it's already told me I can't use a child for this, it shouldn't say "the same" villager. If it was an adult it would be appropriate, but perhaps it should check if it was a child and in that case say "another villager"