Who is the tallest?

A terrible photo, Sara took this quickly with her phone, looking directly into the window didn't help, but hey ho, the only way to catch these two these days is unawares.
As always when these two cousins meet up they banter each other mercilessly, they are so funny its like watching a comedy duo act, it always ends up who is the tallest? i think Keely has a slight edge on Koen but soon Keely will be slowing down in her height progress where Koen has a couple of years to catch up, i think he will pass her in the height department, as long as their wit doesn't wain, and it remains equal.