I am just my usual self with DILs. I don't make any special effort. I wouldn't want to come across as fake (easily done when your body language just doesn't match what you're saying).
We don't always agree, but agree to disagree. I respect their very different parenting styles, being well aware that there's never one, right way - and don't offer any advice unless it's requested.
Overall, though, I'm just very grateful indeed that they love and look after my awkward sons!
Bereavement/elderly parent with dementia
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