Father and son, Kevin and Luke Williams in Llandudno are worried Luke's mother will not be able to join them at home for Christmas.
Kanyarat Williams currently lives in Thailand, where she met her husband Kevin.
They married in 2002 and lived in Thailand for a year before moving to Wales.
The couple decided to return to Thailand in 2006, but in 2014 Kevin left because of a military coup.
Luke joined his father in Llandudno, but Kanyarat's visa applications were refused.
The Home Office says it is currently reviewing her latest application to ensure that all available supporting documents are taken into consideration.