I just used my imagination again for Sly's father! You can only see his face in toon like style like the father of Le Paradox. You can see Sly's father here too: http://youtu.be/6x7vtyUvKF0 at 0:44 - 0:46. He tells Sly how proud he is on his son! How come Sly see him again? Maybe he used the time machine!
Link
VenHifeng
That would be interesting to see in the next sly game, since I think the next series is based on a place outside of time, so anything can happen.