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"I felt on top of the world if I'm being honest, because I had never had that feeling of anything doing that to me," Davie said.

"But I really don't think that for me, anything has changed about them, they are still mum and dad," she says.

Now a woman in her mid 70s, she had never known much about her grandfather, and paid for the private test to see if it threw up anything unusual.

“This is not about me; I don’t want anything to be about me,” Betts said.

Democratic leadership in the House of Representatives hopes the Grassley-Cantwell bill might have a path to passage in their chamber eventually, but one senior congressional aide said that leadership is doubtful anything will move in the short term.