fruit of the union

Noun

 * 1)  A child, especially from a marriage or similar union.

Usage notes

 * Also used with various possessives instead of "the": "fruit of our union", "fruit of their union", "fruit of my union (with)".
 * "Union" frequently replaced with various related expressions: marriage, sexual experimentation, coupling, relationship, artificial insemination, fertility treatments, cloning, experiments or her "coupling with the milkman", etc.