Plunge into the 1930s. "The Trouble with the Truth” by Edna Robinson, originally published as one of the best short stories of the year in the 1959 edition of New World Writing. Read FREE at link. What an amazing thing time travel is!
"I whispered that my brother and I, and a sister, had been welded together before our birth. The reason Ben was bigger than I was that our sister and I were so weak from fighting with him to get free, that when we had broken off, we had to be stuffed back into our mother for another year and a half. After that interlude, we started to wiggle out again, but my sister proved to be still too weak, and by this time, so was our mother. Tragically, they had both perished during the struggle."