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Douglas was the best. So it was only logical that he used his DNA to create the perfect children. He could both carry and father children, so he didn't need an artificial womb. He just gave himself ivf, the embryos made with different combinations of his own gametes and other people's gametes depending on what he wanted their future powers to be.
Adam was made with his egg and Someone else's sperm. Bree was made with his sperm and someone else's egg. Chase was again made with his egg and someone else's sperm.
He lovingly carried them all, hiding them from Donald, who would only just judge him despite him having the same reproductive capabilities as him. After all they were brothers.
Until his water broke in an elevator with Donald. Chase was ready early.