Spiritually, all in the family of God, but not nationally. There are jewish Christians, but nationally, corporately, they are blinded, and that veil won't be lifted from them until the very end. When Jesus said "For I say unto you, Ye shall not see me henceforth, till ye shall say, Blessed is he that cometh in the name of the Lord" it was a messianic prophecy. For them to say the bolded, they'll have finally accepted him (100% of those still alive will). As the late, great Chuck Missler said, when will Jesus return? When the remnant of Israel begs him to.Kingdoms of Israel and Judea existed simultaneously suggesting a lack of complete overlap between the 2
I am no expert but it seems Judaism perished or morphed into Chrisitanity with Jesus Christ
When Christ returns, he will apportion out to each tribe of Israel the land intended for them, as he promised Abraham 4000 years ago. From the sea to the Euphrates, encompassing most of what we refer to today as the middle east. As God told Daniel, " But go thou thy way till the end be: for thou shalt rest, and stand in thy lot at the end of the days." When the Israelites are together once again at the end, they'll stand in their lot, the land God had intended for them millennia ago. Gentiles will have a different reward, which we can mostly only speculate, but it will be beyond our imagination.