if you and your wife approach the car at the same time and both of you have an individual data set for seats and the like on your keys - the distance between car and keys will be measured.

Within half a meter of approaching the car's door handle, the data set for the seats etc., will be activated. And if theres two of you, it should be that person's data set who is closer to the driver's side door handle or touching it.

I hope this helps.