Small world

It was 1975, I'd arrived at a new secondary school for year 11 studies. At the first assembly of all 600+ students the teachers were introduced, including the new PE teacher, one Mr Burke, a fellow I estimated to be in his late 20s.
A month or so later, while shopping with my mother after school in a the next town down the road we came upon the aforementioned PE teacher.
Mum asked me if I remembered Denis, the son of her very good friend Dot, from Teachers College in the late 1940s, because that's who Mr Burke was.
Turns out I was about right with my age assessment of the fellow, along with other family members I'd attended his 21st birthday party eight years earlier.