"I'm not worried," he snapped immediately. And he wasn't, mostly. It was unlike her to be this late returning from a night shift, but there were still dozens of reasons that might explain her absence. "I'm annoyed that she didn't tell anyone she wasn't going to be home." By anyone of course he meant himself, but that was too telling. If he failed to specify, maybe his sisters would think he was irate about the inconvenience caused to the servants for making up her room and delivering breakfast. It would have been out of character for him to devote any particular care to the servants' lives — they did get paid for this, after all — but not particularly strange for him to find something innocuous to use as fodder to fight with Sina. In fact, if she'd walked in the door this minute he probably would squabble with her about the inconvenience to the servants, so.
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MJ is the light of my life <3