Agree Holly looks very distressed at times, but her mom made the point that Holly had been begging to go on this programme for several years and she had finally relented. So it wasn't as someone said "Oh I know I'll put her on TV" and her mom seems the most grounded of all the parents that I saw. It is a puzzle why Holly (who doesn't like attention) wants to be on the show, but she does, and she's won her place.
Feel sorry for David and think his father is a horror. "I don't think my father believes in me" - dear god - his father is totally emotionally illiterate, but David seems to rise above it somehow.
I wondered why there was more focus on the boys than girls, and I noticed too that children from a minority ethnic background were over represented, although that might not be the case in some geographical areas as white UK children might be minority ethnic group. That's just an observation incidentally.
Do find it fascinating though how unbelievably clever these children are.