Take your documents proving your registration as an autónomo (self-employed worker) and go to the nearest Centro de Salud (Health Center) corresponding to your place of residence. No appointment is required. They will issue you a plastic SIP card on the spot (it is printed immediately). However, it is also possible that they may ask you to provide additional documents to confirm your residential address and social security registration.
You can download the document proving your registration with Social Security at the following link:
For family members, ask at the same Health Center which documents need to be provided for them. Most likely, they will require a document proving your relationship with that family member.
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