Personally i attend without fail, even if it's someone I knew briefly.
And especially if I'm invited. As for a spouse if one of their relatives/friends died I'd make the point of asking them first if they would like me there as support as its the only real decent thing to do for them IMO
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As for chit chat about them and making them out to be " gods " LOL its only for one day mate plus here in the UK we have what is called a wake where we have a drink to celebrate their lives so........... If it's all too much have a drink or 6