I was quite shocked when I read this article and thought there might be a thread on it - as there isn't I am starting one.
If I was the mother of this man's children I would be very tempted to insist that this woman does not spend any more time with them. I am sure that these feelings are fairly commmon - what upset me is that she has put those children in a position where they would know this is how she feels about them - the oldest one is nine.
article is here\link{http://www.guardian.co.uk/family/story/0,,2030147,00.html}