Probably the most rudest, brutally honest, crudest, uncaring, wilful child of all his children. The eldest Armstrong was too harsh to be understood by any of her siblings and sometimes her mother and the older she got, the higher she climbed through the ranks, the harsher her words and actions became.
Though not one to make demands often, Olivier got away with the demands she did make, when she made them and only because her father understood the true intentions behind every one of them. Each uncouth command often had a very valid and reasonable purpose behind it.
While the rest saw it as defiance and bad manners. Father always knew, the meaning behind her words. He knew her callous code language well, he knew behind those cold, uncaring blue Armstrong eyes lay a true blue heart that cared about the family much much more than she liked to admit.
He let her get away with it, because she reminded him of himself when he was younger. She had his tenacity, drive and ambition but in her it was multiplied tenfold.
That was the bond she shared with him. A bond he sometimes wished he shared with his only son.