Not a parent persay because I don't have any, and rarely remember the times when my father was alive, but when I was about 11 years old my aunt said sarcastically with a giant smug grin plastered on her face, "Oh I hope you *never* get a terminal or chronic illness like me because you're such a pussy and a baby you won't be able to handle it." Needless to say she got her wish, because I did develop a mysterious chronic ailment and I am too much of a baby to handle it.
My dad's mother also told me at age 10/11 that if my father were still alive he would, " hate a faggot like me and found people of my kind to be freaks who should burn in hell." She also told me that I was never meant to be brought into this world and that my father had never wanted children but was pushed into it, and continued to lambast about how I shouldn't have been born. When I was 18 my mother sent me a letter saying she felt nothing towards me when I was born, and all of my grandparents have consistently complained throughout their lives about having to take care of an unwanted child.
Relatives also spent years of my childhood calling me a baby, lazy, weird, ugly, compared me to developmentally stunted feral children and did impressions of severely intellectually disabled people to mock how I spoke (or didn't) because of autism, a bitch, dyke, faggot and every other slur in the book, and even when I was not explicitly being insulted they did it in implicit ways- including my grandmother making me get years of painful cosmetic dentistry because she hated the way I looked, wanted to make me "prettier" and now pretends this didnt happen.
Hands down the worst things my family ever did for my mental health though is that my dad's mother blocked my autism diagnosis from happening as a baby because of her sheer hatred and disgust towards disabled people and refused to believe it, and also my family locked me inside for 2 years after I was molested at age 14 with minimal contact with the outside world and nonstop verbal abuse. I had to struggle my entire life, be bullied, and receive 0 help or services for my disability until adulthood because of her hateful and selfish actions.