"I--" Sirius turned so quickly that he knocked over his wine, but was too upset to care. "She what? The raving lunatic! Merlin! How awful for you!"
Perhaps it was too much time with Gaius and Faelan and Harry, but without thinking he caught Regulus by the shoulders in a near-embrace. "Floo me when that sort of thing happens, will you? You should have someone around!"
It struck him that Regulus possibly shouldn't be living alone, but he was certain that he couldn't be the one to fix that -- Haven's Loft wouldn't be his brother's sort of home.
"And what do you mean, 'home'?" he asked, belatedly processing the rest of that. "Cairo? Is that home?"