How can I document my relation to a friend for the purposes of Schengen visa

I'm a Russian national planning to visit my friend A in Portugal. A is also a Russian national, married to a Portugal national B. B is willing to provide me with a term of responsibility letter, that is, he guarantees that he'll accommodate me and he'll bear my costs if needed. (Apparently A cannot do that since she's not a Portugal national).

However, I'm worried that this term of responsibility letter might be dismissed by the embassy as unreliable, so I'm thinking of ways to document my relationship with A and B. A is my long-time friend, we've been studying in high school together, and keeping in touch for some 10 years since then. I can, apparently, ask A and B to provide me with a copy of their marriage certificate. Do I need to (and if I do, how?) document my relations to A?

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Can you sponsor a friend for tourist visa?

A short term US visitor visa or tourist visa can either be self sponsored or you may seek sponsorship from any US resident (friends, relative) to sponsor your b1-b2 visa. Any foreign citizen can apply for a US Visa.

How do I write a letter of support for a visa?

The do's and don't of writing a visa sponsorship letterDO state whether you are a US citizen or legal resident. DO state your relationship to the applicant. DO write the reason for the applicant's visit, including the duration of their stay. DO have someone proofread your letter to make sure there are no errors.

How do I apply for a tourist visa for a friend?

the U.S, you need to write a letter to the U.S. Consulate inviting them to visit you in the U.S. Your invitation letter should include the following: your name, your passport ID#, your reason for living in the US, the names of your family members/friends who wish to visit you, their passport ID#, the purpose and ...

How to apply for a Schengen Visit Visa to the Netherlands (Visiting Family and/or Friends)

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