Very easily obtained, though: just call +46856485160 and ask for it. They also reply to questions like "okay, so did this person have any siblings and what were their parents' names?" and "who else lives at that address?" and so on.

I have needed to provide information for a visa application including family history on dead half-relatives from a branch of the family tree I have very little contact with. It was a breeze. Names at birth, later marriages, dates of death and everything that I had no idea was given without delay (as stipulated by law).

It is, on mrkoll for example. You could also ask the government. Your full social security number isn't a secret.