HURTFUL MOTHER IN LAW

when i had a mmc and me and my partner told his mum she said she thinks it was a little girl and her grandad wanter company in heaven. my partners dad passed away now two years. at the same time there was a week between our pregnancy and sams younger brothers, which they then went on to have a little girl. now the mother in law brags about the LG but cant mention anything about our mc. and shes the type of one who grieves on facebook but her first excuse was that it would upset her youngest son and his girlfriend. but mother in law can put whatever about LG even though it upsets me?? its not her first grandchild either. Now mother in law is saying LG is picked by heaven to be on earth?! am i being an idiot about all this