GM Hearing Player to Player Whispers

Hello, I am running a game of dungeons and dragons 5 edition and I cannot see in the chat what the players are talking to each other when whispers, are there any solutions?

This has been a hotly debated topic in the past. While "solutions" might be possible, the general consensus has always been that we'd rather respect the privacy of individuals.  If your players want to consent to having their private chats observed, you can set up a character with both players and yourself as controllers. Then they can whisper to that character and all controllers will see the result. 

The question is that my players have asked me and there is no problem, how can I do the last thing you tell me?

Assign yourself specifically on the list of controllers of each PC sheet.