Chalk and Cheese

I am the fifth of six children.  My oldest brother and I thought the same, worked and travelled overseas, shared the same sense of humour.  My three sisters,  on the other hand were stay at homes,  scared of travelling, even on a train in case they got lost, and to this day have not been persuaded that technology can be useful.  They are proud of the fact that they don't have mobile phones, computers and that they pay all their bills with cheques or cash.  One  sister received a letter from a utility company informing her that they would no longer accept cheques and all bills must be paid by direct debit or via bank transfer online.  She telephoned the company and said that either they accept her cheques, delivered by normal post, or she wouldn't pay.  They backed down.  They are a sister clique, of which I have never been part, because we are like chalk and cheese and because I have never really lived in the UK.  In January a sister rang me to say that she would be having an 80th birthday but she had forgotten to invite me and when our mother died decades ago they forgot to tell me.  Yet when they want help or advice they ask me.  Families are strange things,  my brother and I are clearly Darbys, in a straight line from our father while my sisters are like our mother.  In this strange situation we all manage to get on, we never argue or fall out with each other.  They think my brother and I are strange and we just accept them as they are.  So why  did someone buy me a book for Christmas called, 'How to kill your family'