A study on mothers of males with gender dysphoria found that 53% of these mothers met the diagnosis for Borderline Personality Disorder.
https://pubmed.ncbi.nlm.nih.gov/2016237/
Abstract
This pilot study compared mothers of males with gender identity disorder (GID) with mothers of normal males to determine whether differences in psychopathology and child-rearing attitudes and practices could be identified.
Results of the Diagnostic Interview for Borderlines and the Beck Depression Inventory revealed that mothers of males with GID had more symptoms of depression and more often met the criteria for Borderline Personality Disorder than the controls. Fifty-three percent of the mothers of males with GID compared with only 6% of controls met the diagnosis for Borderline Personality Disorder on the Diagnostic Interview for Borderlines or had symptoms of depression on the Beck Depression Inventory.
Results of the Summers and Walsh Symbiosis Scale suggested that mothers of probands had child-rearing attitudes and practices that encouraged symbiosis and discouraged the development of autonomy.