US Immigration from Ecuador

My wife is a born US citizen an we are trying to complete the I -130 form by ourselves. In this form they ask for her parent's address of residence. But her mom passed aways many years ago, should i leave it blank or write DECEASED?

Is it necessary to buy a roundtrip ticket for the flight entering the US after the interview to obtain the green card? We, of course, only want a one way but I am not sure if there is a problem checking in for the flight in Ecuador when we don't technically get the green card until going through immigrations in the US.

In your experiences do you think being ALT can have any effect on approvals?

By ALT I mean alternative having tattoos, piercings, dyed hair etc... is this something that can be discriminated against during medical exams and or consulate interviews?

Would love to hear your opinions! Thanks!

Do we need to go to Registro Civil to get new copies of various docs such as the inscripci n de nacimiento, inscripcion de matrimonio with the stamp on the back? Of course they were approved by the NVC but all of those docs are only valid for 60 days. When I uploaded them to the NVC it was within the 60 days, but now it is well past the 60 days. Or do I bring the originals that I uploaded to the NVC?

When sending documents to USCIS (such as a divorce decree in Spanish) is this something I need to have a certified translation of or can I translate it myself?

Should I include both the English and Spanish copies or does USCIS only need the English copy?

Thanks in advance!