FAMILY VISTOR VISA frm PAKISTAN -application mistake

HI FOLKS


I need urgent assitance , my mother and brother applied for family vist visa yesterday and booked apointment , now when my brohter filled online aplication through vhttps://www.visa4uk.fco.gov.uk and printed out the application there was mistake in one of the questions where it says Father nationality and by mistake it is showing OMAN .

NOW what does he needs to do as there is no option to edit the application through the online system ??? what happens now ?

Explain when they submit their documents and it can be corrected at the visa application centre.