So sorry to read everyone else's stories 
My sister and I suffered sexual abuse and emotional abuse from our father (now dead due to alcoholism). He was also abusive towards my mum and although he didn't physically attack her, his angry outbursts always made us feel as though he would. I remember him punching a hole in the wall one day, and also running at my mum and I with a knife on the night we left (they were already getting divorced but we were still living together until the house sold).
We left when I was 8. When we moved house I used to have dreams that he had broken into the house to kill us. they stopped after a year and from then until I had my son. I never felt that I had been impacted by it. It was only after my son was born that all the resentment towards my mum started to surface. I was so angry at her for allowing him to treat us like that (I do recognise that she was also a victim, but ultimately she was the adult). She relied on my sister and I for emotional support. She didn't shield us from anything traumatic. For example, she would tell us about our dad's hallucinations when he was experiencing the DTs, when really she didn't even need to tell us he was in hospital as we were all living with my gran at this point after the knife incident, and she was only going back to the house to check he was still alive/hadn't burnt the place down. My dad found out where we moved to and when he turned up, my mum left my fourteen year old sister to deal with him whilst she hid in the bathroom. I can't understand why she didn't just ring the police!
My mum was also emotionally unavailable (still is) and I have really begun to realise this over the past six years. I am a social worker now and so I have really reflected on my own upbringing and I now see a lot of her faults. Previously I thought she was a good parent because compared to my dad, she was. Compared to 'normal' families, she's awful.
I'd say the main way it has impacted me is in my own romantic relationships. I am very anxious, very needy, I'm always worried people will abandon me. I think I have some form of attachment disorder as I fit the criteria for it, and it would hardly be surprising! However I am aware of this and try to deal with it myself, rather than make my partner aware of my anxieties.
I am a people pleaser, I'll never say no, I get very nervous talking to managers, or during interviews etc. I lack confidence in general. I get very lonely if I'm not around people. For example, in the week I'm ok as I see people at work and I keep busy in the evening with housework etc. I feel really low come Saturday evening if I haven't seen anyone since finishing work on Friday. I think that probably comes from my insecurities about feeling people will abandon me/don't really like me.
I broke up with my son's dad when DS was six months old because I was convinced he was abusive. Looking back now, I can see he wasn't and that it was my own hyper vigilance that saw everything he did through a DV perspective (eg when he had sever depression and didn't get out of bed/lacked motivation/ cried about feeling he was a failure of a father, I immediately thought he was being manipulative. If we had a minor disagreement, I thought it was as coercive control. I have reflected on this a lot though and hopefully won't be as OTT in future relationships).
My sister has many of the same issues I do. She has no children yet, and says she may not have them ever as she doesn't want to be a bad parent. She is great with my DS but will never use discipline (eg time out or 5,4,3,2,1 to get him to listen) because she is worried she will fear him like we feared our dad. Obviously he did a lot more than just use a time out and whilst rationally she knows this, she struggles to be 'bad cop'.
I don't feel it has impacted my parenting of DS really. Whilst I am not a perfect mum, I think I have a good balance, although I can get stressed and shout if we are running late in the mornings.
I understand what others say about feeling very little emotion and having to fake it. I find enjoyment in things like taking DS to the park/to feed the ducks/ playing at home, but I wouldn't say any of it makes me 'happy'. I do tend to feel better in the evenings if we've had a busy day and have been out lots and DS has had fun. But at the time, I just do those things because they're what I know I 'should' be doing with him.
I also buy things to preoccupy myself. I have far too much make up and hardly ever wear most of it, but it's the thing I seem to buy lots of when I feel particularly rubbish!
Sorry. That was long. It's the first time I've ever got it all out.