My granddaughter was born in 2010 to her American mother and English father. Her and I immigrated to UK when she was 7. At first we read the American embassy page, and it looked okay, that as long as mum was American, born in US, granddaughter would be. But I'm confused after reading again, as it seems my daughter would have to have lived in the US when she was 14. Single citizenship does basically save the hassle of carrying two passports if they travel, and the expense of paying and renewing them every 5 years, but I feel it's better for her to have the choice of where she would like to live when she is an adult. Any clarification, or correction to what my husband and I think we read?