A touch of humour might help in the beginning. For example:
"90% of parenting is just thinking about when you can lie down again" - unknown
We've all been there to a degree at some point in the past, surely?! We empathise from remembered experience.
We might say, for example, "Every parent struggles at times. Parenting children can be surprisingly hard work, sometimes stretching coping abilities close to the limit, and can bring up some 'unfinished business' from your own childhood or make you more sensitive to childhood problems that other people have described. If you find that your relationship with your parents or parents-in-law is under a lot of strain and you are contemplating going NC, try instead to talk things over/keep talking things over with minimal judging, arguing and blaming and without making the other mistake of bottling things up too much.
Beware: don't assume that you know what your child's GPs are thinking (mind-reading) or that what you think must be totally correct just because you think it! Be curious about other interpretations/perspectives, be aware that you may not know everything about a situation but have gaps in your knowledge (as do we all, GPs included) and strive to stay kind insofar as this is possible for you. Own your emotions, opinions and expectations - use the word "I" - and try to explain openly and calmly what is in your mind and why you feel distressed. Focus on listening carefully to your child's GPs too and aim to do your bit to keep the channels of communication open to some extent to allow dialogue to take place. If your emotions are running too high and you feel overwhelmed, how about trying a period of counselling or accessing other possible forms of additional help and support?"
Pigeon Lofts - any words of warning? Thank you



and at what point do these estranging adult children listen to their parents regarding how they feel, own up to where they've gone wrong as adult children and offer apologies and explanations.

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. I wish I could say I'm surprised, but I'm not