according google in 1925 85% Swedish kids were born to married parents

and

"Long-term cohort studies tracking historical Swedish registry data from the early-to-mid 1900s indicate that approximately 2.3% to 3.6% of children experienced the death of a biological parent before reaching adulthood (under 15 to 18 years of age)"

so less than 4% of the kids experienced parental death, absolute majority was born into regular complete families, my point was like half of the Lindgren characters are missing parent for whatever reason, not one in 20 books main characters, she was clearly projecting something unhealthy unrealistic into her books, if she was following reality it would be rare in her books and not that many if not majority of her characters are from incomplete families