My son his wife and children live next door to a person that has bees they are always in there garden as a swarm or laying on the grass the children cannot play out when it is warm and sunny they have been stung many times
If that is indeed the case, then as an experienced and hopefully responsible beekeeper, people should not have to put up with situations like that. I would urge your son to do something positive about this matter.
Does the owner of the bees rent his home from a Registered Social Landlord, like a Housing Association or a Local Authority? If they do, this tenant is probably easily in breach of their Tenancy Agreement and is on very thin ice indeed.
If the beekeeper owns his own home, well then people have a right to enjoy their own property, but in my mind this situation easily crosses over into the 'nuisance neighbour' category.
Whether they be RSL tenants or owner-occupiers a 'nuisance neighbour' complaint to the respective Local Authority, like a City Council or a District Council, needs to be made.
Lots of beekeepers in the UK are members of the British Beekeeping Association and by default have Public Liability Insurance. A lawyer will generally not think it worth his while to claim for the occasional sting, but if stinging incidents are regular and if it is ruining the life of a child who might have a compromised immune response then a 'no win, no fee' claim could possibly be pursued.
Lots of beekeepers keep their colonies at what we call 'out apiaries', like on farmland after gaining the permission of a farmer/landowner. If this guy owns a vehicle then he really has no excuse. However, if he's 'transport poor' you can perhaps see why he keeps his bees at home.
