Attractive Parents Are More Likely To Have ...

[joggerjayne]

Attractive parents are more likely to have ...

... lots of sex?

... an affair at work?

... a career in modelling?

... self confidence?

No, none of those. Attractive parents are more likely to have a girl ... according to the generalized Trivers-Willard hypothesis (gTWH) ...

https://www.psychologytoday.com/blog/the-scientific-fundamentalist/201101/beautiful-people-have-more-daughters

[atalanta]

There is some small amount of evidence claiming to show that more boys are born immediately after their fathers come home from war than at other times. This is taken to mean that the ex-soldiers had been making up ( probably rather hastily ) for being s-x-starved. It is also suggested that sperm carrying a Y chromosome swim faster that those carrying X, so the faster ones are likely to reach the egg sooner. More leisurely time spent in bed results in slower sperm ( i.e. those carrying X chromosomes) reaching the eggs later on in their travels down the female tract.
So, if you want to suggest that the original idea might be true, you have to imagine the more attractive people having more time to spend in bed, and less need to be hasty.
Or something.
NB there is not a shred of proof of any of that, but the speculations have appeared in the medical press.

[Cloverjo]

I'm not sure about this. Attractiveness isn't an absolute quality. I've seen identical twins where one is more attractive than the other. Just the tiniest difference in something like face shape or distance between eyes or whatever can be important in that regard.
Also, the report in the OP stated that the children's teachers were asked to rate their attractiveness. Perhaps their behaviour and intelligence would influence the views of the teachers.
I say this as the mother of a son, of course.

[Sir Alec]

Both my parents were attractive.
I am definitely not.