From what the Malfoys had mentioned, it seemed like Draco was lucky to exist at all, never mind a sibling. Personally, there was a part of him that believed it was possibly part issue of the Pure Bloods becoming a bit too... zealous in their attempt to remain pure, possibly part due to the inherit issues that darker magic played on the body, but neither was a proven fact. Given that the Weasleys were a Pure Blood line and they were always quite prolific, perhaps the latter was a factor. Either way, not an opinion he would venture to anyone else, not even his wife.

"A part of me wished I had a sibling," Remus admitted, "but it never would have worked out. In a way, my friends were more like family than my own family." The Marauders had been his brothers, until everything had gone terribly wrong, again and again and again. A part of him squeezed tight at the thought of how he had lost his friends - murder and betrayal.