Himaruya-san updated his web with a panel with
Romano and Rome.
It seems someone asked how it was the relation between Romano and Rome.
It seems Himaruya-san said that since Romano cries happy tears when he sees him, due to his embarassment they don't really meet often which is why they don't have picture together (in the panel Rome was asking Romano to take a picture with him).
LOL this shots down my request of seeing a picture of the Italian family together... -_- still it's cute!
As for real life Italy... I know a good part of south Italy feels more tied to mama Greece than to granddad Rome but still I think it could be fitting Romano oves his grandfather in his own way.