Yes, unfortunately there was sexual abuse in my family history where a (generations ago) father raped and impregnated 2 of his 3 daughters. The first died due to haemorrhage from being kicked in the stomach by the abusive, rapist father's friend.
The 2nd gave birth to a mute, intellectually challenged son. She gave birth alone in bed at 18 (I believe), her other siblings all died before their early 20s. My grandfather was the offspring of the 3rd sister, she died in her early 20s, he was her only surviving child and he was reared by his auntie along with her mute son.
My grandfather and the offspring of the incestuous rape were the only members to survive in that generation. The intellectually challenged boy, being the only son of the only surviving daughter inherited the house (probably out of necessity and guilt). Meaning my traumatised grandfather was forced out to make his own way, by this time with a wife and children (no contraception and married young, lived for a time in the old family home, before getting pushed out).
My mother's generation used to laugh at their mute older (uncle) relative and sneer at him through immaturity and envy, they didn't understand his parentage (the reason behind his unusualness).
I can't write it all down, suffice to say there was generations of trauma, death, poverty, PTS trauma responses.
My grandfather created this huge family, he surrounded himself with children (no contraception, poverty, trauma, proving his virility/no risk analysis/immaturity, no value or time for education). My mother, being his eldest was forced out of school to work at 15.
She is a boomer baby, and she met my father in London and they bought property and built businesses etc, so we grew up with affluence but also a very strong work ethic. My mum was the most financially successful of her siblings, but also has many unhealthy and immature coping strategies. Her mental health has always been unstable. It has taken me years to unpick the historic triggers of the family traumas.
Now that my father has passed, her siblings are more influential in her life, and the family dynamics of lies, denial of reality, mysogyny, favourites, conspiring together to cover up or to create drama has all re emerged with greater aplomb.
BTW - my father's side weren't perfect, but there was none of the extreme trauma or poverty that my mums side experienced. Imagine what it would be like to have a kind, sensible, considerate wider family?!?! I still keep a lot of secrets for my family, because you just can't reveal it all, it's too hard for them, but it's draining for me and they are so damaged (mostly by the poverty but also by the insecurity). When they are mean or sneering or trying to cut others down to soothe their insecurity I now know this is a poor coping strategy, but more and more, I m veering towards distancing myself, to protect myself.
Some of them prefer to live in their bubble, it's easier than reality. My mother can be obstinate about the version of truth that suits her. Denies reality, denies emotional abuse.
I could go on and on, combine all of the above with varying overlapping in laws (in the last and current generations) that have introduced some of their unhealthy family dynamics, it's a minefield. They don't know our past. They don't understand the lies and the pretense, the masking. They believe some of the lies. They have their own families with certain unhealthy dynamics too.
Therapy and self care are required.