I think some people are misreading this, or not read the whole thread.
The father paid his maintenance and paid for the op to go on hols with her mum. He also paid for her to come down on holidays and spend a week at a time with them. Money was tight she says and the only hols they had were cheap camping ones, she didn’t wish to go, she was mid teens, late teens and in her twenties, these siblings were tots and up at the same time.
The only hol she wanted to go on bizarrely is one to Florida, when she was in her mid twenties and it seems expected to be paid for like a child.
It seems her step mother did the best she could as did the father given the distance, but the op fostered a spiteful jealous, entitled, resentful demeanour with them that she’s carried on into her thirties.
Whether this was due to her mothers hostility, who has not been in a relationship in the twenty years since it ended, or because this is who the op Is, is unknown. But from what she’s said, it doesn’t seem to the father or the step mother that’s the issue. The issue they caused was simply on of geography.
The Simple fact she loves her half siblings, shows they did indeed foster a relationship to make her feel included.