"My grandparents were not biologically my grandparents. My dad and his sister were both adopted as babies. Only found out when, after the funeral (one funeral, they died on the same day) I was b#tching about my aunt and her behavior at said funeral, and I said something along the lines of “I just don’t understand how the two of you are even related!’ and Dad came back with “well, actually…” and the whole thing came out."