A few sheets of letter-size paper were like Legos for me when I was a young boy. Thanks mom for sneaking some typing paper home from your secretary job when you were raising my sister and I.
Forgive me, but a small grammatical FYI: it should be "my sister and me", not "my sister and I" - because you're both the object of the verb "raising". The way to think of it is imagining what word you'd use if not including your sister, would it be "when you were raising I" or "when you were raising me" (and then insert the "my sister and" without changing your pronoun).
I was taught that in the subject position it would be "my sister and I" but that in the object position it would be "me and my sister", not vice-versa.
I once took a sheet off an A0 flip-chart at my dad's job, and tried to make the biggest paper plane i'd ever seen. It didn't work at all - it was too flimsy, and just collapsed. The paper would have needed to be thicker as well as bigger!