Well, passion towards cars will come with exposure, exposure, and well, more exposure! The more your sons see how fervent your passion is towards restoring both your E30s, and the E34, as well as your previous cars, Alfetta, Mini, etc, there's always the chance that it will rub off in some way on them.
No worries about them not wanting to follow in their dad's steps too. I guess like you said, when the day comes when you'd decide either to let go these cars, either handing them down to your kids, or selling it to another passionate owner, there's always a price for everything, no matter how precious it may be to you.
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