As the father of a 5 year old and a 2 year old - both boys, I can only quote Dickens in a Tale of Two Cities.
“It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of light, it was the season of darkness, it was the spring of hope, it was the winter of despair.”
I love my sons, and they like each other - when they're not trying to knock each other out. Best of all, they represent about 95% of my photographic subjects.