I've been married years. I dropped my maiden name and use my married name , i have had kids. My brother doesn't want kids and at his age now fairly unlikely. Therefore our family name will end with him. I was wondering how I could legally use a double barrelled surname to incorporate my maiden name to carry it on. Also for my kids if they wanted too. Is there a way of doing it legally myself or does it involve a solicitor. I would like it official on passport etc.