My grandma had two siblings killed in road accidents. The first, her brother, was run over by a milk float on his way to school. The way the newspaper report of his death reads, he and his friends were fooling about, running after the float when he fell under it.
A couple of years later, his sister "a tall and precocious girl" was watching some pigs being delivered to a neighbour, during a blizzard. A boy was left in charge of the horse, but she climbed into the driving seat, at which the horse bolted and threw her out, smashing her head on a lamppost.
Although my grandma didn't die until the 1970s, she never told any of her children about these tragic accidents to her brother and sister.