1 top of table + 1 top of table = tops of tables.
1 child of citizen + 1 child of citizen = children of citizens.
Each citizen child does not require 2 citizen parents any more than each table top requires two tables.
Come on. You’re kidding, right? No one can be that dense.
So are you saying that a table top requires two tables? Obviously a human being has 2 parents but the sentence in question is children of citizen parents to which birthers claim mandates that each child requires 2 citizen parents and that is simply gramatically false.
A of B + A of B = As of Bs.
In set As of Bs, each A may have 1 or more B. There is no mandate that any particular A have more than one B.