1.Margareta Persdotter, cause of death -sorry I am not able to find that information. Either you must check the church records (microcards or thru Genline -
www.genline.se - not free. One have to look her up in the parish where she lived at the time of her death - either in the clerical survey (in Swedish - husförhörslängd) or in the book of deaths (Dödbok in Swedish). Perhaps another researcher holding the microcards and /or subscriber of the Genline can help.
2. Who was looking after the children - sorry! This must be checked either in the clerical survey and/or with relatives, who still know something.
3. Photographs - no idea - I am not related -also refers to relatives living.
4. Military service - the information I found only said he was enlisted. Records hold by the War archives in Stockholm, probably also in the Stockholm City Archives. How much information - no idea. Suggest you first try the Swedish roots site, mentioned below to get general information.
5. He joined the merchant navy.
6. The attachment - a special book showing people not present - due to their job as sailors, people who had escaped from either military service or perhaps emigrated, the clue is: missing persons in a parish.
7. Stockholms Sjömanshus - an authority to whom you must turn if you were going to work as a sailor. their records are partly online - but against a fee. I am sure many reseachers already subscribing to the service given by Arkion at
www.arkion.se General information about Swedish Genealogy:
http://www.genealogi.se/roots/ Bo Nordenfors