Separated from the family

Some friends of mine say they know how I lost my parents ...
I'll tell you how they told me ...

It was a winter day, my family and I lived in a house that was human. They, the humans, dealt with us. They looked after us. That day they left the cage on the porch. It was snowing, it was raining and it was so windy that the cage flew.

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The doors opened. My sister and I left the cage, but the wind drove me away from her. So I landed in a forest. Luckily, I fell into place with fluffy snow and did not get hurt.