My parents used to look after my little boy and niece together 1 day a week while I worked- they volunteered to do this which we gratefully accepted. The rest of the time my DC was in paid nursery. This arrangement understandably stopped during the pandemic. We've since had another child, as have my brother and SIL. There was no mention of the offer of childcare for us this time around and I assumed this meant my parents no longer wanted to take on that role again- absolutely fair enough, they are a few years older and I am happy for them to enjoy their retirement. We put our younger DC in nursery full time. I've just found out through a mutual aquaintance that my parents are looking after my niece a day a week regularly. I was already aware that they do this a lot (this is something that has never been offered to us) but I didn't realise that this was a regular thing. This is while my SIL does keeping in touch days, and they are planning to carry on when she is back working I believe. I only managed to do one KIT day on my mat leave due to having no childcare (my other half had limited annual leave at the time to cover me). AIBU to be upset? Should I broach this with anybody? Or is it just fair enough that my parents are free to do what they want with their time? To be clear it's not the lack of help that's most upsetting (although to be fair I would absolutely love some more help as I feel like I'm drowning most if the time ) but rather the disparity and apparent secrecy. For full disclosure I would say that there is a history of my brother and his family being favoured by my parents over me and mine.