I know this is not a permanent solution or super convenient but you can make sure you that you and your family members all have downloaded the BMW connected app and linked the car to the app. If they ever find themselves locked inside without a key, they can just open the app on their phone and unlock the car remotely. I know this introduces new variables (eg. having your phone on you, having cell service, etc. ) and also you may not want all family members having access to these features at all times but at least it's still a decent back up option.
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