NBC - Alyssa Meza loves to tell her newborn sister stories -
and there's one little Aaliyah will probably ask to hear over an over one day.
Nine-year-old Alyssa delivered her own sister.
The girls' mom Monique was asleep in her Chicago home just over a week ago when she went into labor.
Alyssa sprung into action, grabbed a towel, caught the baby and wrapped her up.
But it was quickly clear that something was wrong.
Aaliyah was purple. The umbilical cord was wrapped around the baby's neck.
But Alyssa knew what to do thanks to her favorite TV drama: NBC's Chicago Fire.
A neighbor helped her find scissors and thread and she was able to cut the umbilical cord.
She saved her sister's life while they waited for an ambulance to arrive.
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