It was difficult to forget that misgivings of the past and Magneto's threat simply established the strong hate that boiled inside of Pietro for his father. This was his blood. This was his genes and history. Was this his future as well? It made Pietro sick to think about it.
Glancing behind him after Wanda placed her hand on his shoulder, Pietro didn't even bother to bid their father farewell, knowing that if he turned his eyes away from his sister's, he was not certain he could contain his reactions. Though he wasn't fond of admitting, Pietro was well aware of how quickly his temper could flare up and he was not entirely sure he was ready to go down that road with his father. To challenge him any further than he already had would be detrimental not only to himself, but to Wanda as well and there was no way he would put her in harm's way for the sake of their irritating parent.
Once the door closed before them, assured that Magneto was gone and would most likely leave them in peace for some time now, Pietro fully turned around and stared at his sister for a moment. Their features were so different. It had bothered him as a child that they were not as similar as twins normally were, despite their difference in gender. She was red fire and he was silver ice and yet despite all of that, they complemented each other in a way that made them unstoppable. Magneto had spawned two powerful mutants and while he didn't treat them like the scum of the rest of the Brotherhood, he certainly did not treat them like his children.
Needing the comfort that only his sister to could offer, from one who felt and thought almost exactly the same as himself, Pietro pulled Wanda into a hug, resting his forehead on her shoulder. He'd wished for a happier occasion than this, but leave it to Magneto to walk all over anything that even tried to resemble happiness. "I hate him," he whispered to her, the underlying fear that their father could instill in him keeping his voice lowered even after the man had gone. He may have been strong to his face, but Magneto was strong and Pietro knew that.