Reference for Ketubot 179:12

לעולם אימא לך מה שגבה לא גבה ומאי קודמת לגמרי קתני כדתנן בן קודם לבת

I could say to you that his collection is not valid, what does it mean by “takes precedence,” it means means completely, as we have learned: A son takes precedence over a daughter.

Jastrow