I was a resident of Sweden but moved after living there for 2 years. Can I move back with my minor son who holds a Swedish passport? Can I reactivate my Swedish personummer and get a duplicate card?
Can I reactivate my Swedish personummer and get a duplicate card?
When you get your Swedish personal number, it is valid for life.
Therefore, if you can get a visa or other form of permit to live in Sweden again, you can just resume using the personal number that you were assigned in the past.
However, whether you can simply move to Sweden with your son is another question — probably not, but do post the question separately.