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They might be sort-of-maybe-not-actually-twins ("Astral Twins sounds like those internet wives who say they married Tony Stark on the Astral plane, bro." "... okay, you have a point.") but they're not really that similar. In fact, pretty much every thing they do or say its completely opposite.
Except...
"Thomas and William," Kate says, dangerously calm, the way she gets during battles. She's glaring at them sans glasses, which also makes them feel as if they were an inch tall. "Next time you finish my ice cream, I will finish you. Got that?"
They both look at each other. "It was him!"
Kate just rolls her eyes.