Lee Kaplan, 51, was arrested Thursday in the town of Feasterville on various charges including statutory sexual assault and corruption of a minor, the Philadelphia Inquirer newspaper and other media reported.
The girl's parents, Daniel and Savilla Stoltzfus, gave the then-14-year old to Kaplan in gratitude "for helping (the) family out of financial ruin," according to criminal complaints.
News reports said the parents of the now 18-year-old girl have also been arrested. Kaplan and the victim's parents are being held on USD 1 million bail each.
Authorities said the teen lived in an Amish town in Lancaster, Pennsylvania with her parents and siblings, before the family was kicked out of the community for unknown reasons.
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Child welfare authorities removed the young mother, her two young daughters and nine sisters -- all of whom lived with
The teen and her parents in Kaplan's home.
Officials said Kaplan and the 18-year-old were not married, but acted as husband and wife.
Authorities said they were tipped off to the situation by an anonymous phone call.