The picture posted of him in Kiryat Shmona showed him wearing a kippa. Just the fact that a boy grows up in a secular environment in Israel and seeks out and puts efforts into this part of himself is impressive, regardless of whether or not he is not-yet-frum. He does have a sister who is frum. They’re Jewish – they have zchus Avos.
I’m truly happy for Mr. and Mrs. Netanyahu, may they, and all of klal Yisroel see Yiddishe Nachas from all of our children.