Asians will know

I think it's his parent are never happy with anything he does and are never proud of his accomplishments.

That what I thought at first but then I thought it might be something deeper

Ik no one gives a crap 4 yrs later but in some Asian cultures they count the time in the womb as a year. So the dad, having been out of his mama for 5yrs, would be called 6yrs old. The kid, being (I assume) raised in another country that does not do this, would be called 5yrs old.