If there are extraterrestrials, how are they our brothers? Would he say that angels (another being created by God) are his brother? We are all brothers because of unity in Adam, a unity that would not exist, obviously, with an alien.

In the interview headlined, “The extraterrestrial is my brother,” he said he saw no conflict between belief in such beings and faith in God.
“Just as there is a multiplicity of creatures on earth, there can be other beings, even intelligent, created by God. This is not in contrast with our faith because we can’t put limits on God’s creative freedom,” he said.
“Why can’t we speak of a ‘brother extraterrestrial’? It would still be part of creation.”
Funes, who runs the observatory that is based south of Rome and in Arizona, held out the possibility that the human race might actually be the “lost sheep” of the universe.
There could be other beings “who remained in full friendship with their creator,” he said.