"Thomassin thought mothers and fathers would be more accepting of daughters showing sadness than sons and more accepting of sons showing anger than daughters.

Instead, the study found only mothers had differing attitudes based on gender, favouring daughters expressing sadness and anger more than sons.

Fathers showed no such preference, suggesting that fathers lacked this implicit bias related to the expression of the two emotions,” said Thomassin."

the study involved nearly 600 parents

https://news.uoguelph.ca/2019/11/mothers-push-gender-stereotypes-more-than-fathers-study-reveals/

https://psycnet.apa.org/record/2019-46241-001