Birth certificates (both siblings)
The cleanest proof — both certificates show the same parents' names.
Marriage certificate(s)
Works as a substitute if it lists parents' names; one member submitted both their own and their sibling's marriage certificates for this reason.
Passport
Can also serve as relationship evidence where it records parents' names.
Home-country ties evidence
Financial, social and family ties (job, property, dependents) — more decisive for a visitor visa than the relationship proof itself.
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