Remember that certain "verbs" are followed by the acc.+ inf.
So, we have: Nonne "intellegis" non modo amorem nostrum, sed etiam familiam tempore augeri?
If you still can't make sense of the sentence, try adding 'quod' after "intellegis" and convert the accusative into nominative and the infinitive into indicative (this, I believe, is what the Mediaevals did to this type of sentence construction).
Hope this helps.
Lisa: Relax?! I can't relax! Nor can I yield, relent, or... Only two synonyms? Oh my God! I'm losing my perspicacity! Aaaaa!
Homer: Well it's always in the last place you look.