Heir
Achieve The Normal Ending


After turning the lights off in night 7 and clicking the red circle you have to stay in the light.
After completing this task, move to your bed and sleep for a while.
After waking up move upstairs to face the demon. Click it to get the normal ending.

Hitched
Achieve The Secret Ending


Before starting the ritual in night 7, go to the piano, grab the flower and start the ritual.
You will now receive the secret ending!

Nope
Achieve The Secret Ending


Complete the first steps of the normal ending. However instead of going upstairs to face the demon after you woke up, go downstairs and leave through the front door!

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Have a nice day!