No, Hermione and Harry wouldn't have gotten together. Hermione and Ron had affections towards each other for a very long time, and Hermione and Harry had a platonic relationship. Harry and Hermione were friends, while Ron and Hermione were lovers.
Oh yeah, if Ginny was Hermione's sister, Ronmione would be incest lmao.
No, HarryxHermione wouldn't have happened. Hermione never had any affections towards Harry and Harry never had affections towards Hermione. It would've remained a platonic relationship. Hermione would've married some Muggle or something idk.