Well if you'd like to give them a kiss (and receive one in return), give it a go and see what happens - they might just be wanting to give their gran/nan a kiss and cuddle! If they don't, it doesn't mean they love you any less. My Nan wasn't tactile at all (I never saw her kiss or cuddle anyone) but she was still a lovely person whom I adored and would have done anything for her. But I would have loved a cuddle from her 
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Then DGS lent over and kissed my cheek.