Art. 1 SCA Acquisition by descent
1 The following persons are Swiss citizens from birth:
a. a child whose parents are married to each other and whose father or mother is a Swiss citizen;
b. a child of a female Swiss citizen who is not married to the child's father.
2 A minor foreign child of a Swiss father who is not married to the child's mother acquires Swiss citizenship as if at birth by establishing the father's paternity.
3 If a minor child who acquires Swiss citizenship under paragraph 2 has children, the children also acquire Swiss citizenship.