No. there’s no mention of Zendarin or his parents just a vague mention of lesser Windrunner cousins. The book only really focuses on Sylvanas’s immediate family. But there is a nod to their existence in one early chapter.
Don’t give yourself false hope that Golden actually has any understanding of existing lore, because she doesn’t. She doesn’t give a care about continuity. As an honest review so far, that’s the most disappointing thing, it’s not holding true to continuity. It has all the typical Goldenism but this is a big one. This is going to be a big talking point next week. Unless she’s talking huge swathes out of Arthas: Rise of the Lich King verbaitm like she just copy and pasted…yeah, continuity for only things she wrote.
Zero context spoilers but on page 182 Golden proves how much of a masochist she really is after Elegy. You thought Elegy was bad?