That's diametrically opposed to reality lmao. The poorer a family, the likelier to reproduce like rabbits. If you go back as recently as a few generations in European countries, white family sizes were much larger. Their best tactic for greater reproduction percentages would be to regress an to abject poverty.
I don't mean a litter of kids but 3 or 4.
All the white people I see (under 50) have 0 (majority) or 1 or 2 (max).
I work with some older people, around late 50s and up, and some have 8-10+ siblings. I couldn't believe it.