Twenty, the same with my stepmother. It was the 1970s, so children were to be seen and not heard. My teachers and GP raised the alarm - both having met her as well as seen what was happening to me - and when Social Services came out they wrote her a nice polite letter in advance, so she was expecting them. The filthy house was cleaned from top to bottom (even the oven which she hadn't cleaned in several years), and cakes were baking in the oven when the social workers walked in.
They believed her schtick that I was a 'damaged' child, who was "making things up" and left, never to trouble us again. It was not only terrifying for me, being left in that situation, but frustrating as I'd been made to look a liar and the GP and my teachers, who had believed and supported me, left with no recourse and no way of 'saving' me.
She would rant and rave (You can imagine the lengthy rant we got when she had to spend several days tidying the house) - but only when dad was out of the building. In front of him, she was sweetness and light.
It was only many years later when I had kids myself, I realised the enormity of it. How could anyone do that to a child who'd just lost her mother, ffs?
My stepsisters had got a load of insurance money when their dad died so could supplement the frugal diet with their own money, if hungry. I had nothing. She refused to buy us clothes and shoes ("To teach them the value of money") but gave us £1 a week in a brown envelope (She said it was the entire Child Allowance, I suspected she pocketed the majority of it though) and we had to save that and buy all our own clothes and shoes. Some things were actually dearer in the 70s than they are now so predictably I wore clothes and shoes with holes in! Again my stepsisters didn't as they had their extra money.
We had a dog we had had after Mum died, and before Dad remarried. She loathed this poor dog with a passion. When I went to uni, the dog was still alive. He got an obstruction eating something from a compost bin (he was probably hungry too) and had to have an operation. I was by then a student on a full grant. She made my Dad send me the entire bill to pay.
I knew if I didn't, my Dad would never be allowed to speak to me again, so I somehow found the money. (Only told my brother this last year and he was horrified. had he known, he'd have paid the bill).
Eventually, we got a house where we could have a dog and I managed to finally 'rescue' him but he had been so neglected for so long that we had to have him PTS - he was literally falling apart.
Over the years she paid a fortune to insurance men and my dad had a low wage but a good pension, so he retired early. All she had ever spoken about for years was how she couldn't wait for us all to leave home, so she could travel and do what she wanted. All my relatives noticed this was her favourite theme - how she couldn't wait to see the back of us (Not just me, her own daughters too). The minute Dad retired they went on endless naff (but expensive) cruises and she really lived it up.
She was a very peculiar woman - never had her hair cut since the 1940s, as her dad had loved to stroke her hair (ew) and made her promise never to cut it. (We always thought Freud would have a field day with her). So her hair was this fuzzy, decades' worth of split ends mess, sort of piled on her head with pins. No-one ever saw it down. Also had BO that could knock out a horse. Very odd that my dad liked her as my mother had been very dainty, pretty and immaculately dressed - she was a big, sweaty mess. Yet turned on the fake charm, flashing her yellow smile if she wanted something. She'd also be convinced men were after her. Once a load of workmen wolf whistled my stepsister and she sat there preening, assuming it was meant for her. She didn't look in the mirror and see what we saw when we looked at her, that was for sure.