How we cite our quotes: (Section.Paragraph)
Quote #4
The bourgeois sees in his wife a mere instrument of production. (Section2.46)
Marx would say children are seen as a source of capital by the bourgeoisie, as labor to be exploited. So women are seen as the source of that production.
Quote #5
[The bourgeois] has not even a suspicion that the real point aimed at is to do away with the status of women as mere instruments of production. (Section2.47)
Karl seems to be suggesting that women can only be fully free to be people (instead of property) once they're liberated from the contradictions of class struggle.