India, Nov. 25 -- A copy of the first Superman issue, which three brothers found while cleaning out their late mother's attic, has fetched them $9.12 million this month at a Texas auction house. The comic book was discovered alongside other rare comics that their mother and her siblings had collected around World War II.

The brothers discovered comic books in a cardboard box under layers of brittle newspapers, dust and cobwebs in their mother's San Francisco home, Associated Press reported.

Earlier, she told her children about a valuable comic book collection in her possession, but the children never found it until they put her house for sale and decided to comb through the items in the basement, Lon Allen, vice president of comics at H...