Theresa Riggi: Schooling a 'flashpoint' in relationship
Amber Sebold, 27, from Peterhead, a mother-of-three, said the three children had come from "the most loving family home you could imagine".
But Mrs Sebold said the one dispute that drove a wedge between the couple that she knew of was over the homeschooling of their three children.
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Hide AdMrs Sebold, who moved to Scotland from Missouri and whose husband Arron, 33, also works in the oil industry, said: "Obviously, Pasquale and Theresa had their issues and homeschooling was part of that but I tried to keep out of that.
"I would have never in a million years thought she would have hurt them.
"Her whole world revolved around them."