One clarification here please: so the fact that both of us have only IE citizenship - does it still mean that we CAN use EU1 route.
Correct?

No, neither of us have a citizenship of another EU country. We used to have a Belarus citizenship while now we have an IE one.
Does is change the things in any way?

Hi all, I am a former citizen from Belarus. In August 2008 I have successfully received IE naturalization, and has become Irish citizen. I am not exploring the ways of how to bring my mother to live with me in Ireland. My situation: Irish citizen, home owner, stable 45k income, married to Irish ...