It's not unusual for parents (around our school anyway, socially deprived area) to seek to move their children merely out of temper. Not considering the child at all.
An example that happened last month. Mum tried to move 3 children because nursery staff suggested she might like to buy a bookbag for nursery child.
Mum went ballistic. "He had a perfectly good rucksack, why should I?". Agressive to staff, who were only asking. Mum then added various points for effect (to justify her fury). Like he's not going to be allowed to take a book home to read unless he buys a bookbag. Totally untrue.
Phoned school and when she didn't get a call back that day she contacted another local school to find out if there were places for all 3 children. She was ready to take them out of school that day. Out of nothing more than anger.
Head of other school stalled, experience knowing moves in haste don't always have the child's interests first. Contact made between the two schools.
Deputy of original school phoned parent. Bookbags were just offered, not compulsory. And no child would ever be denied a book! Certainly no need to disrupt the education of older 2 children because of this, they aren't involved at all.
Such parents do not put their children's needs first.
The Heads of current and receiving schools have to put the children's needs first, above the parent's anger/frustration/unreasonability because there are many parents who don't put the child's need first.