Babies switched to creatures that look like them
Lady gives birth to twins. Exhausted after the birth, she wakes up to see a woman trying to take her babies and give her some creatures in exchange. She tells hub, and police. No one believes her.
Later, at a park, her children disappear. When they are "supposedly found", she knows, even though they look like her children, they are not.
Later, at a park, her children disappear. When they are "supposedly found", she knows, even though they look like her children, they are not.