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 Kogorp questions the butler, Conan steps in with his own questions. The butler asks who the child is.
- 小五郎:
- 「いやー、わたしの知り合いの子でして…」
- “Well, it's the child of an acquaintance, and...”
- 「蘭!! ちゃんと面倒見てろ!!」
- “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.
面倒見る means to watch over someone.