Born out of wedlock, I-130 documentation required?

JEandSB

Registered Users (C)
My wife (naturalized USC) wants to get GC for her natural father who is listed on birth certificate, but her parents were not married at time of birth. What documentation can prove a satisfactory sponsoring daughter/father relationship for the I-130?

It would make sense that the same documentation for a sponsoring father/daughter relationship as described in the I-130 instructions, but it's not spelled out that way...

Many thanks...

James and Sandra
 
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