Karyn Lynch, 13, and her sister Caitlin, 19, enjoyed a meet and greet session with the group at their farewell tour in Glasgow on Sunday.
It was arranged by Symphony of Dreams, an award-winning charity that arranges wishes for people with life limiting illnesses in areas of deprivation.
Charity worker Linda Ann McConnell contacted The Wanted's UK representatives, who were happy to help make this dream come true.
Both girls, who are from Dumbarton, suffer from a genetic disorder which has left them with learning difficulties and thinning of their bones.
Karyn, 13, said, "Thank you for allowing us to the soundcheck party, to meet and being able to hug the band. I got the chance to tell Nathan that I loved him and Nathan said he loved me too."
Caitlin, 19, said: "It was a dream come true. I got smiles and a hug."
Linda Ann added: " On behalf of Symphony of Dreams, we would like to thank The Wanted - Max, Siva, Jay, Tom, Nathan and their management company - for helping to make these dreams come true for two very special girls. One of the most gracious bands I have ever met."