I’m living with my boyfriend of five years. Three years ago his daughter came to live with us. I’m the breadwinner, making nearly 10 times what he makes in a year, and so I’m heavily supporting our family.

We recently leased a car, when we had otherwise been relying on public transportation, Uber, and cabs. The car is completely in my name and on my credit, though his income was taken into account when we decided we had enough collectively to get a car. My boyfriend does not have a license nor does his under ‘driving-age’ daughter. When I talk about the car, I often call the car “my car” though I drive them wherever they need to go on most occasions. My boyfriend gets really defensive about me calling it “my car”. – which I think is mostly out of habit from when I had a car before, but could also be because I’m the only one that drives it, pays for it, and is ultimately responsible. Should I be more sensitive to this being a family car and calling it “our car”?