I can challenge CT's claim to being the least Rotherham person here...I was born in Watford and nearest place I've lived to Rotherham is when studied in York for 3 years. So got a mostly neutral home counties accent, but my mates say I have a bit of northern lilt now and again that comes from my parents.
Do pretty well on the family scale though - I'm a first generation non-Yorkshire (everyone as far as the family tree goes back is from Yorkshire, stretching Halifax to Scarborough by mostly South Yorks). Dad's from Maltby and his Dad (who I never met) was a coal merchant.
Mum was born in 1956 in a fish & chip shop her parents ran for a while over the road from Millmoor - maybe some of you here will remember it, I think it was where that Chinese is now.
Gran lived mostly in Maltby but died last year, just an Aunt now in South Anston from close family.
Dad wasn't hugely into football when I was growing up, I preferred Manchester United because I liked many of their players in the 90s when I was a kid. Then honestly got bored of them winning all the time and also got more interested in family background, and asked to have a tour round Rotherham from me Mum and to go to a Millers game with me Dad when I was about 12. I live in London now so most games I go to are down here with the odd home one thrown in.