I want to know the answer to the following question:
Who struck his parents with an arrow?
All the background I'm provided with is that "Apollo was called Ismenius (/ɪzˈmiːniəs/ iz-MEE-nee-əs; Ἰσμηνιός, Ismēnios, literally "of Ismenus") after Ismenus, the son of Amphion and Niobe, whom he struck with an arrow.". Is that enough to answer the question?