It's a football rivalry which pits Norfolk against Suffolk, county against county, city against town.
However, for the Baker family of Lound, near Lowestoft, it is also one that pits husband against wife and brother against sister.
When East Anglian Derby Day rolls around, their home becomes a house divided, with fans of both clubs sharing the same roof.
In the yellow corner, mum Michelle and 11-year-old son Zach are avid Norwich City fans.
In the blue corner, dad Chris, 46, and daughter Charley, 12 - Ipswich Town supporters.
Normally a harmonious family like any other, when it comes to football no result can leave this entire family happy - with Derby Day making for some interesting dinner table debates.
Mrs Baker said: 'We try not to speak about football as we always end up arguing. But to be honest, when I first started going to football when I was 15, the banter of it was a big part of what appealed to me.'
Mr Baker said: 'My grandfather was an Ipswich fanatic so I picked it up from him and he passed it on to my daughter - I'm sure his first words to her were Ipswich and town.'
The family enjoy friendly fun at the expense of each other's clubs, though it always remains that - friendly.
Mrs Baker said: 'Chris is always trying to wind me up - whenever I cook a meal he doesn't like he will ask if I have been following Delia's recipes, but it's always good fun.
Mr Baker added: 'Michelle doesn't let me keep my Ipswich scarves in the house and she has a Norwich teddy that I always hide away.'
The fun also extends to their children, who sit either side of the Norfolk-Suffolk divide.
Charley said: 'Whenever we play football in the garden it's always Ipswich against Norwich.'
Zach added: 'We argue about which team is better all the time.'
While over the decades bragging rights have been relatively equal between the two sides - Norwich with 39 wins, Ipswich with 40 - in recent years it has been mother and son that have come away happier from the meetings.
The Canaries have come away victorious in five of the last eight matches between the two sides and are unbeaten this decade.
However, last season both clashes ended with honours even, with identical 1-1 score lines, which for a family divided is probably the safest result.
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