What an awful dilemma raggy
It sounds to me as though your half sister is being very thoughtful and is happy for you to go - if you want to.
I think I would go because it might lead to a relationship with your sister which could be good for both of you in the longer term. She might also welcome having you there.
Please let us know what you decide and, if you go, how things were.
Private care for 'cosmetic' issues
Have any of you got all electric cars? Pros and cons please.