It can be translated as "What is that?"
"Watashitachi nani suru" translates to "What are we doing" in English.
何 (nani)
It means ( You're beautiful )
Grandfather and Grandmother(but, maternal).
he and nani are not Hebrew words. Perhaps you mean: hee (היא) = "she" hineni (×”× × ×™) = "here I am" hineh (×”× ×”) = "here is..." or "behold"
maternal grandfather -maternal grandmother
Its his own choice
In Hindi, you would call your grandmother "Dadi" if you are the grandson or "Nani" if you are the granddaughter.
Nani Nani was created in 1995-10.
'Nani mo mamoranai.'
"Ittai nani o shiteiru n desu ka." Or, more colloquially and much more casually, "Ittai nani shiten no."