Each would see the other seemingly slowed down while they are moving apart and speeded up while they are coming together. But the one who turns around will see the speed-up for exactly half of his or her travel time while the ones back home will only start seeing the speed up after seeing the turn around (which will be more than half way to the reunion as it will take some time for the signal from the turning traveller to get back to Earth).
Of course both are aware of the signal taking some time to travel between them, so neither would think that what they were seeing was actually happen exactly when they saw it. But after correcting for signal travel time both would infer that the other was ageing more slowly throughout both departure and return with the only difference being that the traveller would infer that the homie had speeded up (or suddenly jumped ahead) during the period of turn-around.