Lately I've been having the urge to sell my wife's card to buy a bigger family car for the both of us.
Why do you have to sell her car to do that?
No one is touching her car anymore.
It is smart to buy a car that the whole family can fit in. Make sure that you are being respectful of your wife's property. Making a decision without her input could make her resentful and possibly cause the marriage to end,
I know, I plan on having a conversation with her.
I'm glad to hear that, that's going be the best way to approach the situation. That way you don't have to worry about her being shocked if you sold the car without her permission. I'm sure she'll be very receptive to getting a new car for the family.