It is lovely to have some of the small things from your Dad, Milo - my son has a spot on his bookcase, a little sandstone box with some ashes, a tiny crocodile his dad loved, some rocks and a model car he made, plus his first oil painting (small) - he likes to have these things around him.
It will get easier, mate, just take it one step at a time.
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jules "Love is good for the human being!!" (Ben, aged 10)