" She said her mother never told she and her sisters they were born in Iran because she did not think it mattered....."

Horsefeathers ! If the mother truly didn't think it mattered , why didn't she tell the truth on the application ?
It couldn't possibly be that the Ayatollah Khomeini had lead the Iranian Revolution in 1979 that overthrew the Shah Palavi ? Or that Ken Taylor had  safely rescued six Americans from there and that Canada had closed its Embassy right then.? When Monsef arrived here Iran would have been one of the least popular countries at the time. 
Her mother knew exactly what she was doing .