PIO Card for my Son

[xers]

My Son is an US citizen and right now hold an Indian Visa.
Me and my wife became naturalized US citizen and got our US passports.
I am planning to apply for PIO card for myself and my wife.
At the same time I want to apply for my Son .
The question is.... Since I hold a US passport on what basis I should claim my Son's PIO ?.
For a PIO...
1) One should have held Indian passport OR
2) Parent/Grand parent is born in India and permanently resident in Inidia.

Can I claim my Son's PIO with my Indian passport which will be cancelled due to my US passport?
OR
Should I get my Parent's passport copies as a basis to claim the PIO for my Son?


Let me know If anybody who were in the same situation and have applied and got the PIO.

Thanks in advance

[immihelp]

You can use your cancelled Indian passport to claim PIO for your son.

[xers]

Thank you so much