He obviously came back for the funeral, so his decision was surprising to people.
There doesn’t seem to be much reason as to why he wouldn’t come."
But the young ages of the kids and how sad the funeral would be likely also played into it.

That said, Louis' absence was not overlooked by royal fans.
“Unfortunately, Prince Louis is absent but completely understandable.
So happy to see Prince George and Princess Charlotte!!”

Meanwhile, another person tweeted, “No Prince Louis.
He’s too wee for this, not yet 4.
Good to see Prince George and Princess Charlotte though.

They certainly have grown.”
“I can’t imagine Prince Louis sitting still for long.
Imagine when we see Prince Louis again.”