 ይህ እውነታ በጆርናል ኦፍ ፋምሊ ኢሹስ (Journal of Family Issues) መጽሄት በወጣ ጥናት ተረጋግጧል።
Nyuzipepala ina ya ku Spain (ABC) inatsindika mfundo imeneyi pakafukufuku amene bungwe lina loona nkhani za m'banja (Institute of Family Matters) linachita.