CITIZENSHIP BY THE MARRIAGE OF THE PARENTS
When a Swedish man marries a woman who is a foreigner, any the child prior their marriage who has not acquired Swedish citizenship becomes a Swedish citizen if the child is unmarried and under eighteen years of age.
CITIZENSHIP BY NOTIFICATION
A child that was born abroad and has not acquired Swedish citizenship but whose father has held Swedish citizenship since the birth of the child, acquires Swedish citizenship on notification by the father of the desire to that effect before the child reaches the age of eighteen.
A child that does not hold Swedish citizenship acquires Swedish citizenship on notification by the guardian or guardians of the child if the child
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Holds a permanent Swedish residence permit, and
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Has been domiciled in Sweden for five years or, if the child is stateless, three years.
Notification must be made before the child reaches the age of eighteen.
A foreigner who has reached the age of eighteen but who is not yet twenty acquires Swedish citizenship on notification if he or she
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Holds a permanent Swedish residence permit, and
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Has been domiciled in Sweden since reaching the age of thirteen or, if the child is stateless, fifteen.