This storyline is what causes Fiona (Emmy Rossum) to be awarded custody of her siblings, but it was still unbelievably cruel for Frank to lash out in a fit of anger and call Child Protective Services on his own kids, especially when Fiona was working so hard to provide the best life possible for them. Throughout the show, she’s been the only mom the other Gallagher kids ever knew, and she always took care of them at the expense of any hopes or dreams she had for herself.