>>149925436
Look closer!
There are 2/3rds of a birthday cake visible in the bottom right corner with two candles.
So Lily must have been 2 or 3 years old at this moment and Jack 4 or 5 years old.

But there is a funny picture of a probably 1 year old Lily with a 3 year old Jack drooling.

But yes, both pictures are adorable.