Our expert says:
Discretion is the better part of valour, they used to say. Your sister does seem to have the most useful approach, and I wonder what makes it so hard for you to follow here example here.
Maybe because you're a bit more like your mother in feeling a need to defend your ways and decisions, rather than feeling just that bit more confident and, knowing you're right, having the grace to do as you wish but leaing her feeling as though she might be right.
Your mom sounds like one of those people whose entire sense of identity is bound up with knowing what they know and giving their advice as though it was an organ donation !
Maybe she feels self-conscious that you (I don't know about your sister's history) have been better educated and qualified and have made a career or careers in ways she didn't do (maybe never had the chance to do).
So these are some small areas where she feels confident and stakes her identity upon being the One who Knows about them and whose advice must be golden. She sounds generally under-occupied - does she stay at home with perhaps not enough to do within her own household to keep her mind occupied ?
Smiling and accepting the advice, not with any implied or explicit promise of actually following it, but thanking her for giving it, boosting her amour propre, may help. One can say : "That's an interesting approach - maybe I'll try it if my own way doesn't work. "
Sometimes you can find tasks for her to do which don't matter very much but where she can take full charge and feel good about being useful, to keep her occupied when she would otherwise interfere elsewhere.
You know you won't change her mind or her habits. But you don't need to do so - just change your own habits of the ways you respond. Don't rise to the bait.
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