I do feel there are a few people that are being very harsh with their replies here. Firstly from someone who is also undergoing cancer treatment, where emotions run high, along with the sheer exhaustion that runs alongside this awful disease, to be told this lady is basically using her illness as a "Wo me" as well as some sort of weapon towards her Son and DiL, to see her new Grandchild, is really not being very kind. I don't think she is doing this at all. The lady just wants to know if her son is being patronising and speaking to her in a derogatory way. So in answer to your question Pampas07 then yes, I do. On saying this it is usual for the new Mum to want her own Mothers support once the baby arrives, but I also hear you where you say it isn't your DiL that is the problem here. I understand your Son is a new parent, and it is only natural that he and your DiL want to spend time together with their new baby, and getting her into some sort of routine. However he shouldn't need to be rude to you in explaining this, and asking if you would mind just bearing with them while they do this, but they will welcome you gladly once they are ready for you to have some quality time with the baby, and begin the task of Grandmother duties!!
There really are polite ways of saying things. š
I wish you all the luck with your treatment, and do take this time at the moment to look after you. š