Oil and Water? Families?

Mix like oil and water If two things or people are oil and water or are like oil and water, they are very different and they cannot exist together or be mixed with each other successfully. He'd known from the start that Nick and Adam would never mix. They were like oil and water. It is what it is. I have been spending more time lately with the "family." I'm thinking of a line from Helter Skelter "a family unlike any other family." "Thank goodness" exclaimed a juror. "We are not trying the sex lives of these people; we are trying the murder lives of these people." Okay, reader do you have a "murder life?" Actually these days I don't have either!