Ditto the Heath Ledger fact (m)
That was my first thought as well. In fact I did not think about Wuthering Heights at all, I thought it was going to be a post about the Ledgers.
For the OP: Heathcliff is a GP of mine and I love Catherine but certainly not as a sibset. They were lovers, it's just like using Romeo and Juliet or Tristan and Isolde for brother and sister. Rather weird.