My biological father( found him on Facebook when I turned 18) keeps messaging me telling me to stop…

My biological father( found him on Facebook when I turned 18) keeps messaging me telling me to stop posting pictures about my pregnancy or my baby because it's offensive to his other daughter and his wife. Well I apologize that your other daughter had a miscarriage, granted she was on drugs but I mean come on! I have to hide my belly? Just unfriend me then geez!