Family friendly, economical and reliable car wanted for several years!? Bugdet 15K

Hello dear ones, since it will be a bit too expensive for me with the new car purchase and my 4 combos in other post have already been placed very nicely opposite by you, so I must now continue to search. My second option is to buy a used combo 2-3 years old for my growing family. And now the details: -In the radius 100 km from 67227. – driving distance per year about 13000 km, even a long holiday trip, should be in addition. -60% highway, 40% city. -Buget is a maximum of 15000. -Important is large trunk, parking aid, possibly Navi. -Spritzy and safe overtaking on the highway should be possible by car, otherwise no sporty car with a lot of horsepower. -The car should serve for us for several years. About 10 years would be good. What I like visually is the Opel Astra Toourer and Opel Insignia. Who has experience with it? The cars should be heavy and therefore consume a lot. Insurance should be a bit expensive for Insignia. How do you see that? And of course I would very much like to enjoy more variants. Thank you in advance. Wolfgang