Typo in `models.py`

children = db.relationship("Chile", secondary=many_to_many_table, backref=db.backref("parents",lazy=True),lazy="subquery")

should be

children = db.relationship("Child", secondary=many_to_many_table, backref=db.backref("parents",lazy=True),lazy="subquery")

[HeliumMonitor]

The difference is the Child vs. Chile typo