The kingdom is the reward of the saved, we are born into the kingdom by a resurrection. The Father is in charge forever: under Him is Jesus Christ, and then under Him will be the saints as they have qualified for their various positions.

Mat 6:33  But seek first the kingdom of God and His righteousness, and all these things shall be added to you.

1Co 15:50  Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; nor does corruption inherit incorruption.

Mar 4:11  And He said to them, “To you it has been given to know the mystery of the kingdom of God; but to those who are outside, all things come in parables,