8yo son lost his very close grandad suddenly from cancer that was very quick.He went to the funeral and cried alot but since then he has started junior school and after 2 days the teacher asked to see me. He is shouting out, very touchy and is obviously playing up. I explained to the teacher about our loss of grandad and she has given him a 'mentor' to give him a bit more attention and to talk about his day. I hopehis helps. I am finding it very hard disciplining him. I know that he has been affected massivly but his attitude is terrible. He is grumpy, lazy and doesnt do what he is told at all.Its wearing me down. I try to be positive but this lasts for about 10 minutes before I am screaming like a fishwife. Any previous experience or advice please...