The YouTube host of this video complains that Rosita does not use doves in her dance, but other birds, thus misrepresenting herself. But as we can see from this article, that is a mere technicality, since Rosita was quite intimate with doves also.
Jacob Zimmer, when asked why he and his son Donald were having a joint wedding to a pair of sisters (Grace and Dorothy Tripp), offered this explanation:
Donald's always liked farmin' like me and he likes music, too— plays the cornet and the tuba both. On top of that he likes to fish as well as I do, so it's just natural we'd like sisters—particularly sisters who like to go fishin'."