No idea if you are being unreasonable or not.
Are you TRULY aware of how loud your children are?
Can you ask them to keep the noise down?
Are you actively encouraging noisy games, screaming, yelling etc?
My neighbours are driving me up the fucking walls at the minute, they have two toddlers, and seem to be actively encouraging outside as long as it is not raining, loud games, screaming, tins filled with pebbles etc and NO attempt whatsoever to keep noise down.
I am self isolating for 12 weeks as vulnerable... I cannot leave the house/back yard and so for me there is no escape from this at all.
Whilst I absolutely understand that children make noise and thats normal and fine, this woman has no idea how loud her 'speaking to the toddlers' voice is (we call her Loud Mummy, I can hear her now through my closed, brand new double glazed patio doors, as clear as if she were stood in my own yard) and of course now her eldest is copying her very loud voice and tone in bossing her parents and baby brother around...
It is excruciating to listen to all day, on top of the screaming, throwing things, growling, shrieking, bashing stuff etc.
If I heard her even ONCE ask the kids to keep it down, or attempt to bring noise levels down.. that would actually help... but she never does.
So maybe your kids ARE really loud and you are deaf to your own kids noise and perhaps just making the attempt to ask them to be quiet would help?
Or maybe they aren't actually that noisy at all and your neighbour is a dick. Who knows.