They're all paid off. So we have some decisions to make.
I'd stick with what you have, honestly. I really like my model 3 and its done everything I've needed it to do for the year and a half I've had it. It's had zero problems other than an annoying rattle or two. I fixed one, Tesla fixed the other. I wouldn't hesitate to recommend the car to anyone, EXCEPT you. You already have the best of all worlds (top down sports car, family road trip mobile that can do light offroading and still get good mileage being a TDI, and a roomy EV that is your economy car). I'm not seeing what "problem" you have that buying the Tesla would solve... ... unless you have too much money in your wallet and really want a car payment and a decent jump in insurance rates.
There's a ton of EVs coming out in the next couple years, and even a new model 3 at some point, with probably significantly better batteries, faster charging, better auto-driving, hopefully more consistent build quality, etc... If you still want one later, get one later. For now, enjoy your PAID OFF vehicles.