I tried Perplexity and asked about Harriet Tubman and her children. The first answer was correct, but when I asked about Jency, a supposed child with her first husband John, it got confused. It claimed that "Jency Tubman was Harriet Tubman's niece, born in 1846 to her brother John[1][2]. She died on August 4, 1944, at the age of 98 and was buried in Liberty Cemetery, Oneonta, Blount, Alabama[3]."
When I clicked on the "detailed" feature, the answer changed, becoming "Jency Tubman was Harriet Tubman's daughter[2][3]. She was born in Bucktown, Dorchester, Maryland on January 1, 1846[1]. Jency married Robert E. Maddox on November 27, 1876 in St. Clair, Alabama and they had at least one son and four daughters[3]. She died on August 4, 1944 in Oneonta, Blount County, Alabama at the age of 98 and was buried in Liberty Cemetery" citing FamilySearch, a G2G post and Findagrave. The same sources were cited for each.
Neeva just directed me to search results.
I also asked ChatGPT about this, and the response was similar, but it invented a fictitious lineage:
"Jency Tubman Mattox was the daughter of Ben Tubman and Marie Louise Anderson Tubman. Ben Tubman was the son of Isaac Tubman and Caroline Tubman, who were both born into slavery in Maryland. Isaac was the son of Rit Green, who was Harriet Tubman's mother, which makes Jency Tubman Mattox a descendant of Rit Green and a great-grandniece of Harriet Tubman. Marie Louise Anderson Tubman was a school teacher, and she and Ben Tubman had four children together, including Jency."