Kashyapa and Purnima are the sons of Sage Marichi. Purnima had three children, one of them is Devakulya.
Here is verse from Srimad Bhagavatham 4.1.14,
My dear Vidura, of the two sons, Kaśyapa and Pūrṇimā, Pūrṇimā begot three children, namely Viraja, Viśvaga and Devakulyā. Of these three, Devakulyā was the water which washed the lotus feet of the Personality of Godhead and which later on transformed into the Ganges of the heavenly planets.
I was wondering how someone's child could be water. I understand this someone is not common person like us but a sage. Still, I want to know:
- How Devakulya born as water?
- Why Devakulya was transformed into Ganga?