For information and requirements for Visitor's permit please check Migration Agency's webpage https://www.migrationsverket.se/English/Private-individuals/Visiting-Sweden/Visit-Sweden-for-more-than-90-days.html
Submission of application for a visitor's permit to Sweden is accepted at the Embassy by appointments only. If you want to book an appointment please send e-mail to email@example.com
Residence permit card
Since your visit is longer than three months, you will be given a residence permit card to show that you have the right to be in Sweden. This card must have a photograph of you as well as your fingerprints. You must therefore have your photo and fingerprints taken at the Embassy. This can be done when you apply or anytime during the process. When the residence card is ready, you must collect it from Embassy.
Note that it may take up to four weeks after you receive your decision until the card is made and delivered to the Embassy. It is NOT recommended for you to purchase any ticket before you collect your card. When you arrive in Sweden, you must present your residence card together with a valid passport.
National Visa (D Visa)
A national visa (D-visa) is only issued in exceptional cases. According to the law, special circumstances must apply in your case. Note that a family visit is not considered special circumstances, or that the processing time for a visitor's permit might be longer. The fact that you have previously been granted a D-visa does not automatically mean that you can get a new one.
All the documents required for Visitor's permit are to be submitted for D-visa application. Please check Migration Agency's website for requirements https://www.migrationsverket.se/English/Private-individuals/Visiting-Sweden/Visit-Sweden-for-more-than-90-days.html
The Embassy reserves the right to ask for further documentation if needed.
Submission of application for a D-visa to Sweden is accepted at the Embassy by appointments only. If you want to book an appointment please send e-mail to firstname.lastname@example.org