According to the hadith of Ziyarat Jamea Kabeera (زيارت جامعه كبيره) the we means God and Ahl al Bayt.
But for understanding this we should first know what is "Ziyarat Jamea Kabeera" and then understand it well and deep. this Ziyarat does not have a human source. it is narated by By Imam Ali an Naqi (A.S.) one of the 12 infallible Imams. it has a divine source and is from divine knowledge of Messenger of Allah Muhammad SAAWW. this Ziyarat is best source for knowing the real rank of Ahl al Bayt. each sentence of this Ziyarat is a knowledge about Ahl al Bayt. many scholars have written commentary books about this Ziyarat. each sentence of this Ziyarat is similar to one verse of Quran and is interpretation of one verse of Quran. underestanding this Ziyarat is not easy. it is like understanding Quran.
For example one verse of Quran says:
ثُمَّ إِنَّ عَلَيْنَا حِسَابَهُم
Then indeed, upon Us is their account. http://tanzil.net/#88:26
Now the question is who are "us" in this verse? so we look at this Ziarat to find the equivalent sentence:
And accounting of people is upon you
So it is known from this verse and this sentence that the Judgement at Judgement day is transferred by God to Ahl ul Bayt and they are judges of Judgement day. but based on laws of God and under supervision of God. like a president transferring his duties to his ministers.
Transferring an authority to another is called Izn. God transfers his authorities to some of his trusted friends (Awlia). the top of them are infallibles Imams or Ahl al Bayt.
This is one case of Izn in Quran. in this verse God says that he has given the Izn of bringing dead people to life. so who has this Izn can simply bring a dead to life. only by a simple will in mind.
In Quran it is said God gives Izn to some of special infallible persons.
For example this verse is about Izn:
[The Day] when Allah will say, "O Jesus, Son of Mary, remember My
favor upon you and upon your mother when I supported you with the Pure
Spirit and you spoke to the people in the cradle and in maturity; and
[remember] when I taught you writing and wisdom and the Torah and the
Gospel; and when you designed from clay [what was] like the form of a
bird with My permission, then you breathed into it, and it became a
bird with My permission; and you healed the blind and the leper with
My permission; and when you brought forth the dead with My Izn
(permission); and when I restrained the Children of Israel from
[killing] you when you came to them with clear proofs and those who
disbelieved among them said, "This is not but obvious magic."
Full Text of Ziyarat-e-Jamia Kabeer with english translation and information about it