Thank you again for digging deeper into this. I have done some research on my end too and I noticed the following:
"You, the sponsor (and your co-signer, if applicable) must prove that you have enough income to support all the persons you'll be financially responsible for, including yourself, once you become a sponsor.
If you’re invited to apply, you’ll have to provide proof that you meet the income requirements for each of the 3 taxation years right before the date of your application."
It doesn't indicate exclusively that EACH ONE has to provide proof of income for 3 years. Also, someone else mentioned on this thread that they know someone who has sponsored pgp eventhough they have lived in Canada for less than 3 years (requested further details).
I am sorry but it is still not clear because the income requirements are for combined income and not individually so I see a potential of acceptance of combined proof of income as well.
Can you please further help me with this? Thanks again. Really appreciate your help!