In the end Andromeda did die in the house. She died the same Vivian Harmon did. Giving birth to a baby girl.
This child being out love was on turn raised raised with a life full of it.
In tradition Andy named her daughter after a star. Cassiopeia Emmiline Langdon.
Cassie went on to live a great life and had lots of children and grandchildren. They all lived in the murder house, so Tate and Andy got to see their family grow.
And Micheal didn't grow up to me the Antichrist, just a mass murder. Though with the knowledge he learned from living in the murder house he was never caught.
"Look at what we made," Tate says holding his love in his arms.
"And you never thought you'd be happy," she smiles up at him.
"Happiness entered my life the day you walked through that door," he tells her.
Andy simply smiles up at him and gives him a quick yet passionate kiss. They continue to look out the window watching their grandchildren play.