Although we live in Spain, I've always spoken exclusively English to my two children since there were born (a 10-year-old boy and an 8-year old girl). Since I am their only "source" of English, their level leaves a lot to be desired, although they can have conversations with English speakers without any trouble. Also the fact that many words have exactly the same pronunciation but a different spelling and meaning doesn't help much.
When my son was 3 or 4 I told him that Hitler didn't like Jews at all. He was disproportionately surprised and I couldn't quite understand what he had found so astonishing, until he said, "But how can any one NOT like juice?" You see, the difference between the soft and the hard sound of the s is not very detectable.
Three weeks ago I said to my daughter, "I've told you a hundred times to put on a pair of knickers (undies) after your bath. I don't like you sitting at the piano with your bare bottom". She burst into tears and left the room saying, "Now you have offended me, Mum. I DON'T have a bear bottom, I have a girl's bottom!" I choked with laughter...
I'm sure you have many funny stories too. Will you share them?