Definitely not, I have never cried at funerals. I even apparentely smiled at my grandad from my mums side funeral (He was a alcholic who would physically hurt my mum). I don’t like my mum but if anything I was happy to see him gone. You shouldn’t feel bad for not crying. I went to someone I would consider close with and didn’t cry and then heard hysterics in the front and felt bad for not crying. I just realised that I am not the type to cry at funerals so it is not mandatory but just don’t ever smile like I did because that would be worse. 
Don’t let the gossips in your family get to you as long as you know why then it is none of their business.
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