'Children' in the Bible

The Spirit himself confirms to our spirit that we are children of God,

and if children, also heirs--heirs of God and fellow heirs with Christ, if indeed we suffer together [with him] so that we may also be glorified together [with him].

that the creation itself also will be set free from its servility to decay, into the glorious freedom of the children of God.

nor [are they] all children because they are descendants of Abraham, but "In Isaac will your descendants be named."

That is, [it is] not the children {by human descent} [who are] children of God, but the children of the promise are counted as descendants.

And not only [this], but also [when] Rebecca conceived children by one [man], Isaac our father--