Diego lets Tony admire Gina's beauty, he purposely doesn't tell Tony about Gina's pregnancy. Diego deliberately uses Tony's madness for beautiful women to launch his action, because if Tony finds out that Gina is currently pregnant, his plan will fail. Tony would immediately refuse to help, that's why Diego didn't tell his friend Gina's current condition.
"This girl is really your step-sister? You're not joking, are you? Could it be that you stole a photo of an artist to deceive me," Tony accused repeatedly, seeing the beautiful teenage Gina photo in his hands at this time made Tony doubt Diego's statement.
Diego chuckled. "We're not blood related, of course she's very different from me. Look at the photo of her mother, my step sister looks like her mother who mixes Asia. So it's natural that my step sister's face is different from mine."