Well maybe Kame has a brother we don’t know of yet! xD But i guess Junno mistook Koki’s family with Kame’s and he said 5 questiongly but anyways the female annoucer said also Junno is the ouji (prince) in KAT-TUN :P Yes he is a handsome and cute prince charming ^.^ ♥
In Catch 2/7, when Junno was asked who receives chocolate the most among the members, Junno says Kame, since he once receives about 60pcs of chocolate.
Interviewer: what did he do with [that much chocolate]?
Junno: Maybe ate them all? He has so many brothers after all (laugh). They say they all receive some. Aren’t there like 5 brothers in Kamenashi family? Just a little is good enough, you know.