Interpret Socrates at 508B where he claims, "...this is what I'm calling the offspring of the good, which the good generated as something analogous to itself."
Here are some alternative translations of this section:
Reeve: "this is what I called the offspring of the good, which the good begot as its analogue."
Bloom: "the sun is the offspring of the good I mean - an offpring the good begot in proportion with itself."
Rowe: "The ‘offspring' of the good - the sun, which the good fathered in propotion to itself."
Jowett: "this is he whom I call the child of the good, whom the good begat in his own likeness."
Allen: "you may say is what I meant as the offspring of the Good, which the Good generated in analogy to itself."
Quandt: "my account of the Good's offspring, which the Good gave birth to as an analogue to itself".