On vacation, especially your money is popular and it works out excellently through children
For the complainers here, I recommend the article "You live here in paradise" on taz.
Distorted perception, in my opinion. There are many advantages here for families and children.
What I find shocking is this pigeonholing - children and then the peace is gone - and this consequence, then selling the home without giving the new neighbor a chance.
Where does this insight actually come from?
The neighbors may already have experience with children and have decided for themselves not to want to live in direct proximity.
Maybe your brother's children have already "had an effect," without you noticing or knowing?
You also have to see that they may have lived here in the utmost peace and quiet for 20 years, say. It always depends on the relation and one's own pain threshold. I think Sandrasix put it very fittingly:
If I had a Ferrari, MY loud car wouldn’t bother me.
But if someone drives along the street during my usual quiet times, it could annoy me
I think that's human.