In the same neighbourhood.

 I think it's good if relatives, siblings, or friends live in the same neighbourhood. Then, whenever you cook something that turns out very well, you can send a sample cup to them just to enjoy together. They sometimes might share something with you, too. If you need to go anywhere, you can ask for a ride if available. You can keep your kids at their house, or they can keep their kids at yours if they need to go somewhere urgently. It's also good for mental health. However, they all need to have good terms with one another. Otherwise, this can be the most tremendous pain in life.

So, when you have good terms with someone, you can make a plan to rent or buy houses in the same neighbourhood.