Oh I have loads of these!
The month before our wedding dh's charming grandmother told him 'it's not too late' and claimed that our wedding was putting dh's brother under financial strain (exactly HOW is still a mystery to me today)
More recently - my own parents could win a prize for this - after a 7yr struggle with secondary infertility and several unsuccessful treatments I very unexpectedly got pregnant last year, we were beyond thrilled. Sadly had a MMC at 11wks and in the waiting phase from the scan to the MC itself my mum phoned and told me it was incredible that I had managed to get pregnant at all (was 44 at the time) and now that we knew it could happen we'd want to start taking precautions to ensure it didn't happen again as we wouldn't want that........her timing was shocking! AND she cornered dh and said the same to him. I think it was only the shock of the entire situation that prevented me from telling her to fuck off and mind her own business.
Then 2 mths after the MMC my sister announced her pregnancy and my parents 'decided' that that was enough grieving time and I needed to 'get over' it and that my sister was now the one who needed the support and i needed councelling if I was still sad after 8 weeks....
My dad texted me to tell me not to be sad, that it was never a real baby anyway, it would have had something wrong with it and anyway now my sister was having 'a real, live, healthy baby and we could all celebrate that,and our dd would not need a sibling as would have a (10yr younger) cousin instead.
I cried for days over that text.
I have not forgiven them and will not. I simply cannot imagine ever being that insensitive to my dd. I pray that I never will be.