No it's not. You have X number of dollars going to pay a certain sector made up of Y laborers. So>X/Y
and then you add in twice Y more laborers>X/(Y*2)
So you've cut the dollars/laborer in half.
We could quibble about how many more people were added to the pool, but the fact remains that adding additional laborers to a sector decreases the money going to existing laborers in that sector. >but if both people in the couple make money, they'll get twice as much money!
Until wages adjust, however. Which they do, quite quickly, in these scenarios where business interests are intentionally flooding the market with labor. That's one of the few times that wages adjust quickly (realistically, given that these operations are planned years in advance, one could argue that they're actually just "building up" the adjustment over the planning period, but that's semantics).