Why can't I adopt kids despite already having killed Grelod the Kind?

I want to adopt kids in Skyrim (on Xbox). I have the Hearthfire DLC, and also have killed Grelod the Kind. I walk in to the orphanage and Constance Michel is just doing things regularly and won't talk to me. I have a house in Whiterun with a children's room.
Any idea why I can't adopt?
Best Answer
First, you must go to Windhelm and talk to Aventus Aretino.
He will reward you for killing Grelod. After this, you will receive a letter from a courier, from the Dark Brotherhood. This begins the quest "With Friends Like These...."
After you get this note, sleep in a bed. You will be abducted by the Dark Brotherhood. After this, you either need to join the Brotherhood or kill Astrid.
After completing this, you should be able to adopt children.
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Can I adopt after killing Grelod?
You need hearthfire, and to complete Innocence Lost, then wait for a courier, then read the letter then you can adopt if she agrees with your living situation.What if you already killed Grelod the Kind?
PC PS4 If Grelod is killed before starting this quest, the quest will become glitched. When told by Aventus Aretino to kill Grelod she will already be dead, making the quest impossible to complete. This can be fixed by entering the console command: SetObjectiveCompleted DB01 20 1 .Liz Phair - Why Can't I? (Official Video)
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Answer 2
After you are inducted into the dark brotherhood, you can get them. Steps below
1: get inducted
2: become thane, and build your house
3: go to the orphanage and adopt a child (after you get the letter stating that Michele has taken over the orphanage)
MAKE SURE YOU HAVE A HOUSE BUILT WITH CHILDERN'S BEDS TOO, OR YOU CAN'T ADOPT A CHILD
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