Superman doesn't have any kids in the traditional comic storylines.
Superman has been depicted as having kids in various comic runs. For example, in some alternate timelines or specific story arcs, he has offspring. But it's not a consistent aspect across all Superman comics.
In the main comic continuity, Superman has no sons. However, there might be alternate or less-known story arcs where this could be different, but those are rare and not widely recognized.
Yes, Superman has had kids in some comic storylines.
The number of Superman comics is quite large. It depends on different series, special editions, and reprints. But it's safe to say there are hundreds, if not thousands.
It's hard to give an exact number as it depends on various editions and reprints. But there are likely several thousand copies out there.
It's hard to give an exact number because new Superman comics are constantly being produced. But there are thousands of them over the years.
Superman's comic deaths are hard to quantify precisely. Sometimes his 'deaths' are temporary or part of alternate timelines. So, it's not easy to give an exact count.
It's hard to give an exact number, but Superman comics have sold in the millions over the years.
Magneto has three known children in the X-Men comics: Quicksilver, Scarlet Witch, and Polaris.
In the traditional Superman comics, there's no mention of him having twins. The focus is usually on his solo adventures and interactions with other superheroes.