I think that no matter what you do, you're not going to get a quality solution here.

Has anyone had this problem and if so what was your solution.

When the cat is outside it may be no ones responsibility.Your solution to keeping your indoor cat calm and your children relaxed and happy might be to use one of the "Cat Boundary Sprays" you can buy online or in a pet store.Try spraying it on the window ledge inside and outside (it needs to be reapplied every so often) and some cats can "Hold Their Breath" and cross it, but not sit their while they smell it.It's cat repellent that when it dries they don't like the smell, though you probably won't be able to smell it.Spraying it AT THE CAT doesn't work, it only wastes it, it needs to be sprayed on an area you want them to avoid and then it needs to dry (it's not bug spray, it's a stink that cats want to avoid).Also here is a link to The Feliway Cat Comfort plug in diffuser, it helps keep indoor cats calm and happy (its a love phermone that only cats can smell) https://www.feliway.com/us/Products/FELIWAY-CLASSIC-DiffuserGood Luck!

Use the opportunity to learn about what he wants and think about solutions.

If you want to make it without  (much) money...You do what I did.1) Get a domain name (a good one) DON'T make it XYZ "Home Solutions".

Care needs to be taken if there are trees growing on the fields as the roots can damage the system.

ironically I already informed Adriano of Rino Home Solutions & you Jamiel 

It helps to have a multi-pronged approach with facebook ads and direct mail for brand awareness, helpful website content for trust building, retargeting ads and more direct mail for staying top of mind, and google ads for high intent keywords when they're ready for a solution to their problem.  

Learning does not count, only actual work.The solution?

That being said, apartments and renting offer an appropriate solution.