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Thanks for your responses. I agree that she tries to make her life sound perfect... she's married to a man that is quite a kn0b, who doesn't do anything with their two little kids, and is terribly rude to my parents.
My Mum is no saint by any means. Up until my daughter was born, my mother could be a complete witch, but since she's had grandkids she's really mellowed.
SS - she knows that I know, but always asks that I keep it between the two of us. I do get really annoyed by having to cover about things, and occasionally let things slip, sometime accidentally, and sometimes on purpose.
I don't understand why she makes up most of these lies, especially like last weekend when she said she was in the park with her friend, but was actually on the beach in Brighton with her in-laws, but then posts all pics online.
I'd be devastated if my relationship with my daughter was like this when she's older!