Watch the kid properly with ちゃんと

Vocabulary Explanation: Do it properly with ちゃんと

Conan and Ran end up with Kogoro investigating a kidnapping case. As Kogoro questions the butler, Conan steps in with his own questions. The butler asks who the child is.

小五郎(こごろ):: 「いやー、わたしの知(し)り合(あ)いの子(こ)でして…」; “Well, it's the child of an acquaintance, and...”; 「蘭(らん)！！　ちゃんと面倒(めんどう)見(み)てろ！！」; “Ran! Properly look after him!”

ちゃんと is used here to say Ran needs to watch the kid properly, the way a kid should be watched over.

面倒(めんどう)見(み)る means to watch over someone.