SHARED (BETWEEN ALL FOUR):
Glowing eyes similar to a flashlight's.
The color of the glow depends on the character.
Shapeshifting
Kenyon is able to shift without any resemblance to his "pure" form, while the others' (usually) keep their natural eye color and skin tone at the very least.
How different they can shift besides that depends as well.
Incredulous and inhuman strength.
Higher endurance.
While they are not fully invulnerable (if hurt enough they can be quite weaker than normal) they have  on average almost triple the endurance as a human's.
Accelerated healing.
Rosetta has a faster healing process than her father and siblings and depending on the injury, 2-3x as fast.
Telekinetic (partially) based manipulation.
They have the ability to, among the same general power, use telekinesis based on what they can control.
Example: Rosetta can, among other things in ferrokinesis, carry metallic objects in the air telekinetically