The Margaret Reardon/Sarah Norton family is in Oneida, NY. That Hattie and Burt appear to be twins and are reportedly born in NY.
Your Hattie and Bert report that they were born in Indiana. Hattie was born 1871/72 and Bert 1877/8. They also report that their father was born in NY and mother in Maryland.
1900 South Bend
Harvy Teeter 51 IN
Sarah Teeter 57 MD PA MD
The report they'd been married 5 years
Bert J. Norton b.1877 IN NY MD (step son)
Sarah Thornton 38 MD
Harriet Norton 8 IN
Birdie 4 IN
1870 Center, Marshall County, IN
Andrew Norton 35 NY (Indexed on Ancestry as Worton)
Sarah Norton 30 MD
Margaret Norton 54 NY
Denver Norton 10 IN
I think Hattie's parents are Andrew Norton and Sarah ?. There is a marriage record for Sarah Hatfield and Andrew Norton in Marshall County Sep 16, 1866. And there are two Hatfields living with Andrew and Sarah in 1870. I couln't find the Carnes connection (except in people's family trees).
At least you can eliminate Reardon from the mix. Hope this is helpful.