I have had 4 - and they are currently 6.5 years, 5 years, nearly 4 (in November) and 2.5 years.
None of them sleep through.
However, the two oldest no longer come into our room and let us know that they are awake, but the 5 year old crawls in with the 6.5 year old so we know she wakes up because she's not a sleep walker, and the 6.5 wakes up because he has a clock in his room and he tells us what time it is that he wakes up.
The youngest two wake up and get in our bed, so we know they definitely still wake up - multiple times.
I don't expect any child to sleep through after my experience - but I don't sleep through the night and I'm 36 so I guess they take after me.
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