Thank you all for your comments.
I see that for the most part you feel that I am wrong feeling this way and I appreciate your input.
I would like to say a couple of things
Jenpax you say you were with your mother when she was ill, but only at weekends, you did not leave your children for an extended period and I am assuming they were at home and their routines were not seriously impacted. Then you say your daughters stayed with you on and off, but not for the entire duration of your illness. Do you see the difference
Grandmabatty if I refuse to look after the little boy it will make my daughters position even more difficult than it already is, and yes, I do know all of the details
Alexa I have always been an active member of their family, from the time the children were born actually.
GagaJo I have never ever let my feelings for the mother interfere with my feelings for the children, I love them both and I have looked after both of them periodically since they were tiny.
And finally a question... are you all saying that you too would leave your small children for an extended period of time, and I am talking weeks and weeks, regardless of who was ill? I am sorry, I would not.