Do you find yourself routinely saying a word or phrase that was coined by a child of yours? Children are hugely influenced by their environment, but can have a lasting effect on it too.
One of Daniel's phrases when he was around 2 years old was to ask for something "just very big" if he wanted a lot of it (breakfast cereal for example). That has now become a silly family phrase.
Another one of Danny's is to play "Ha-ya" which essentially means play-fighting with Daddy. It's quite cute when Isabel says it - she can be quite fierce when she wants to!