On the earlier Geminis (TC, TD, TX), the tail lights are quite similar to the Datsun 260c. From a distance, in the dark with the tail lights on, it wouldn't be difficult to mistake the two. They're also roughly the same size (Gemini is 4.2m, Datsun is 4.4m), and both have two and four door models.Rear 260c
Very distinctive tail lights on the datsun
Rear Gemini
Looks same as in the driveway
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The one in the driveway is a later model Gemini, but it's unlikely he kept the same car for 25 years.