My wife’s great-grandparent’s Petrillo families were used and abused in their 1910 census transcription found on Ancestry. Below is the original image alongside the info in the Ancestry database. Red highlighted ones are incorrectly transcribed.

Even more odd than such bad gender-bending transcription is the fact that Mary & Katie are both listed as being 7 years old in the database (really 5 & 4 in the image), yet Ancestry has their estimated birth years listed correctly.

I can see how the reverse “F” for “Female” might throw a transcriber off as a possible “7”, but then how did the birth year get correctly calculated?

Click on image for full size version.