Not unless its the same species when they evolve
If two Eeveelutions mate and produce two offspring at the same time, are they considered twins? And if those two Eevee evolve into different forms, are they still considered as such?
Im a knotty Riolu/Lucario/Buizel....
(My character depends on what is preferred by the partner, which i would prefer to play with either a human or ome of the two Pokémon i am not playing as)