1) The I-485 interview is not automatically waived/excused.
2) No, the I-485 interview is standard and is not automatically waived so the fact that they have an interview is not necessarily a bad sign.
3) They could probably expect general questions regarding their application. As for tough questions, they may wish to be prepared for any questions with respect to any preconceived intent to immigrate to the US. Although they waited sixty days before filing their green card applications, this does not necessarily eliminate all questions regarding your parents' intent when they originally entered the US on tourist visas. It is more likely that the USCIS officer just may wish to see your parents in person to verify information on their applications.
4) Yes, it is possible that your parents will be know if their green card application are approved at the interview unless the USCIS Officer determines that he or she needs additional information or requires a second interview.
Thanks but what are the typical answers that will satisfy immigration in terms of having intent to immigrate with visitor visa during entry?
You are welcome. Truthful answers that evidence that your parents planned to only visit you and your family in the US and during the course of their visit, they decided that wanted to permanently reside in the US.
There is a presumption that their green applications were filed in good faith because they was filed after they have been in the US over 60 days so the questioning, if any, may not be that in depth.
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