In the ninth volume ("Biografias") of the Colombian encyclopedia "Gran Enciclopedia de Colombia" there is a biography of the Colombian author Fanny Buitrago. It can be read here (pages 96-7, in Spanish). It is attributed to Letty Buitrago, so someone of the same surname.
I'd like to know whether Letty is a relative - maybe even a sibling - of Fanny.
The evidence for this, other than the shared name, is the fact that the biography contains quite a lot of specific, unsourced info that only a family member would know, like the birth-places of F.B.'s parents. (This example is particularly noteworthy because a shorter biography of F.B. in "Gran Enciclopedia de Colombia 4 Literatura" is more vague about the birthplace of her parents, and was apparently written by someone else).
However I can't find any other evidence, and a shared name is too little to go off, especially because Buitrago is not an uncommon name in Bogotá. I know that F.B. has siblings (and aunts, and a cousin), because she says so in a 1990 article. I'm having a hard time finding more info because my Spanish is not very good.