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The Jewish word "heaven" was used by them as a substitute for the word "God." So Abraham Issac and Jacob in the Kingdom of heaven means Kingdom of God to them and does not relocate them to some unknown place. Mt 8:11 And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven. There you see, it is [of heaven] and not in heaven. Or when this was written for company that was not strictly Jewish as in Luke it reads: Lu 13:28 There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out. The location is now where? Here the very place Jews expected it to be notice how even after the resurrection and further instruction on this kingdom for 40 more days we still get: Acts 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel? kingdom to Israel, kingdom of heaven, kingdom of God, all the same and the place is here.
Joseph