5 Reasons why it's canon that the Inner Circle members are Feyre and Rhys’ kids:
#1 AWKWARD TENSION AKA When Mommy and Daddy Fight
Rhys said smoothly, “I’m not entirely sure Velaris is prepared for Nesta Archeron.” “My sister’s not some feral animal,” I snapped. Rhys recoiled a bit, the others suddenly finding the carpet, the divan, the books incredibly fascinating.
#2 Mommy Feyre not bothering to hide who’s her favorite son
“Honestly,” I said to Lucien, who wordlessly stacked a pile of buttery green beans onto his plate but didn’t touch it, perhaps marveling at the simple fare, so at odds with the overwrought dishes of Spring, “Azriel is the only polite one.” A few cries of outrage from Mor and Cassian, but a ghost of a smile danced on the shadowsinger’s mouth as he dipped his head and hauled a platter of roast beets sprinkled with goat cheese toward himself. “Don’t even try to pretend that it’s not true.”
#3 Cassian struggling with the burden of being the youngest child and therefore mostly ignored…
“Do you know,” Cassian drawled to her, “that the last time I got into a brawl in this house, I was kicked out for a month?” Nesta’s burning gaze slid to him, still outraged—but hinted with incredulity. He just went on, “It was Amren’s fault, of course, but no one believed me. And no one dared banish her.” She blinked slowly.
#4 Daddy Rhysand getting worried over his son an wife
“Shout down the bond when you’re out again,” Rhys said with a mildness that didn’t reach his gaze. Cassian looked back over a shoulder. “Get back to Velaris, you mother hen. We’ll be fine.”
#5 Kids unable to stand their ‘gross’ parents
I smiled, and he leaned in smoothly to brush a kiss to my cheek. Mor muttered a plea for mercy from mates.
Cassian stalked through the front door a heartbeat later and groaned that it was too early to stomach the sight of us kissing. My mate only snarled at him before he took us both by the hand and winnowed us to the Prison.
Quotes taken from ACOWAR by Sarah J. Maas