DD is off at college (just 18, yr13) - My dad is terminally ill
She gets messages from me & my brother being honest & explaining as best we can
Then she speaks to my mum who says "He's fine", "he's lots better", "he'll be back on his feet in no time"
& she believes my mum
& he won't be
& I end up having to be blunt, upsetting her, getting understanding and then a few days later she gets the same sort of message from my mum & it starts again
& no my mum won't listen to reason 
Just Aaaarrrggghhh!