this really depends on how often you go to your grandparent's house
i think around 65 might be good, leaning towards slightly higher rather than lower? like, if i were to consider this range, things that are like 40-60 are things that are about equally familar as they are unknown. what clue would you give for that? i think this fits close to that, although like i said slightly higher
i guess that was a bad way to explain what i was thinking, so let's think about the inverse: what does placing something in the near 75 range indicate? to me, it indicates something that's definitely familiar but you aren't
completely
familiar with it. so like, maybe "your neighborhood" or something – you're probably pretty familiar with it, but you obviously wouldn't know
everything
about it. again, this depends on how often you go to your grandparent's house, but i think that "your grandparents house" is probably like one step down from this level, so i'd guess somewhere from 65-70