Mark walked over to the wall-mounted smart panel beside the framed American flag painting.
He tapped the screen a few times, pulling up the live cloud footage recorded over the past hour.
Officer Davis and his partner stepped closer to the screen to review the video timeline.
The recording clearly showed Sarah walking into the kitchen to prepare the baby's bottle.
It showed little Leo sitting contentedly on his play mat near the base of the staircase.
Then, the camera captured Vanessa standing on the top landing, looking around to ensure no one was watching.
The video clearly showed Vanessa purposefully rolling a small wooden toy down the steps toward the baby.
The baby crawled toward the moving toy, climbing onto the bottom two steps before losing his balance.
Vanessa made no move to stop him or call out for help until the baby tumbled onto the floor.
Officer Davis: That is clear evidence of child endangerment and willful negligence, ma'am.
Vanessa trembled as the second officer walked over to her and produced a pair of handcuffs.
Vanessa: Please, Sarah! Tell them not to do this! We are family!
Sarah: Family is supposed to protect each other, Vanessa. You brought danger into my house.
The officer placed Vanessa's hands behind her back and snapped the metal cuffs around her wrists.
Vanessa wept loudly as she was escorted through the grand double front doors into the waiting police cruiser.
Mark closed the door behind them, locking the deadbolt with a heavy, final click.
The house fell into a deep, quiet calm for the first time in weeks.
Sarah sank into the plush armchair, letting out a long breath she felt like she had been holding for days.
Mark walked over and wrapped his arms around his wife and son, holding them tight.
Mark: It's over now. She will never enter this house again.
Sarah: I just can't believe my own sister would harbor so much hatred toward us.
Mark: Some people let envy destroy their own hearts, Sarah. We have to focus on our family.
Leo cooed softly in Sarah's arms, rubbing his tired eyes as the tension finally left the home.