So sorry for your loss David, grief has no age barriers, and it will be hard for you to come to terms with the loss of your mum because you've been there with her throughout her illness and taken care of her, so you will now be feeling lost i suppose. Perhaps not talking about your mum is how your sister is dealing with her grief, but here at BUK you can talk about your mum as much as you need to David, there will always be someone here for you x