I love how this manga manages to be so deconstructionist and yet so wholesome at the same time. Their sons and daughters keep it as a sort of open secret, as do their grandchildren... meanwhile, the two do harmless and playful meddling in their grandchildren's lives, and sometimes the grandchildren even turn the tables on them. Like that sudden love-confession-photo-op.
And the reminiscing. The wonderful, mildly bittersweet reminiscing. Missed opportunities and difficult times, but love, warmth, and companionship despite all of that. This is the stuff that humanity is made of.
Also: Agreed that Jii-san was very fortunate to inherit that apple orchard. In fact, I think this is one of the spots where this manga misses the mark.
That land is probably worth a fortune, even back then. And not only in property value, but also in how much money it brings in. The family may have been poor in those days, what with the economy being tanked even before the conclusion of the war, but that quickly got turned around into a time of prosperity in less than a generation.
And apples were one of the few things from the Western World that the Eastern World couldn't get enough of. (Granted, there was already a Japanese "apple", but it was nothing at all like the ones we know. It was more like a crabapple and used primarily as offerings for the dead - as in, not fit for consumption by the living.) And it was Emperor Meiji's wetsernization projects that helped bring the domestic apple to Japan, eventually resulting in their own cultivars.
Poor farmers my ass. Baa-san's family must have been really fucking rolling in it to be looking down on a family that grew what was considered a luxury food at the time. The only way I can see her family being that well-to-do was if they had been one of the samurai clans that sided with Emperor Meiji, became a family of stalwart and trustworthy military officers, somehow maintained their honor and integrity throughout the war, and got in at the ground floor when the occupation began rebuilding Japan.
In which case, Baa-san really was a frickin' princess by their definition during her youth.