Mitt Romney's wife has described her Welsh grandfather's determination to give his family a better life as her husband was formally selected as the US Republican presidential candidate.
Ann Romney told Republicans her grandfather saw opportunity in the US.
On the plane to the party convention in Florida, she handed out Welsh cakes based on her grandmother's recipe.
She spent a day at Llangynwyd, near Maesteg, earlier this month for a visit filmed for American TV.
"I am the granddaughter of a Welsh coal miner who was determined that his kids get out of the mines," Mrs Romney told the convention.
"My dad got his first job when he was six years old, in a little village in Wales called Nantyffyllon, cleaning bottles at the Colliers Arms.
"When he was 15, Dad came to America. In our country, he saw hope and an opportunity to escape from poverty.
"He moved to a small town in the great state of Michigan. There, he started a business - one he built himself, by the way.
"He raised a family. And he became mayor of our town."
Mrs Romney 's grandfather was David Davies, a miner who emigrated to the USA in the 1920s.
Mr Davies worked at Coegnant Colliery before moving to Detroit in 1929 to work in the car industry.
He was later joined by his wife, Annie, and his son, Edward, who was Mrs Romney's father.
Dressed in red, Mrs Romney also told the convention about how she fell in love with her husband at a high-school dance and the pair married despite their youth.
En route to Tampa Mrs Romney passed out her Welsh cakes, which she said was a tweak of an old family recipe belonging to her grandmother.
The recipe was later published in the Washington Post newspaper.
Mrs Romney visited Llangynwyd earlier in August, and spent a day at the 850-year-old pub the Old House for an NBC programme.
While there she dined on a Welsh-themed lunch which included Welsh rarebit, rack of lamb, wild mushroom and pea risotto, with a selection of Welsh cheeses.