Translation:Our relationships with our parents are important.
No, "rapport" is appropriate - no one would say bad relationships with our parents are important!
As a native English speaker, I would definitely use the word "Relationships", As it's referring to Our relationships, I interpret that as my relationship with our parents, And your relationship with our parents, As that's two different relationships, You'd use the plural. Although it could also be a dialectal thing, I've often times run into words being used differently in British and American dialects on here.
Well there are such articulations but they're not used anymore https://www.thoughtco.com/articulated-prepositions-in-italian-4056547