Here is a guaranteed conversation starter: Tell someone you’re an only child, born of an only child, who has decided to have an only child. Being an only child is somewhat unusual to begin with. Two generations is rare. But three in a row? It is the genealogical equivalent of a unicorn.
I know this because I am a unicorn. My mother is an only child. My father was raised as an only child. (Technically, he had two siblings, but they were older, lived in a different state, and were so estranged that I never met either of them; now both are dead.) As a result, I have no aunts or uncles. I have no cousins that I know of. I have no siblings.