請教8老師/關於i485表

尊敬的8老師和各位老師，想問問幫父母填485表的事宜：

1）Can interpreter 和preparer be the same as me?

2）on page5 part3 address history: just want to confirm we should put in only parents' address in China (not my current US address)?

3) on page6 part3 employment history: in item 11, provide your employment history for the past 5 years, should we just put in as "retired"? On page7 part3, item 19, provide your most recent employment outside of the US, should we put in the information of the institute where my parents retired from?

4) on page8 part5: is your current spouse applying with you? As I'm filling out form for each of my parents, should I check "no"?
非常感謝大家的幫助！感謝在先！