Delaware requires you to file a tax non-resident tax return if you have any income from Delaware sources, so you do need to file a tax return for Delaware.
The Delaware form 400 is not a federal tax reporting document, so you wouldn't normally be required to enter it on your federal tax return. However, if it reports income that you have not included on your federal tax return, then you should enter that income on your federal tax return.
If you have estate or trust income to report in Pennsylvania, you need to file PA schedule J.
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