I second the Nintendo Switch suggestion. It's a very easy-to-use, relatively small, all-ages friendly console that is still well-loved and up-to-date. It offers a lot of games that are appropriate for the 7-15 age range.
Second choice would be PS4 or PS5. Unfortunately the consoles are huge and take up space, but they play well and work well. I do feel like with their Wi-fi capability, you open yourself up to a realm of parental control problems, but maybe there are settings for that I'm not aware of.
I owned the Xbox One and XBox 360 for a while, and unfortunately I can't recommend. Found the user interface to be very clunky and would run into crashes and freezes here and there. The controllers also felt like they were designed for people with huge hands, another downside for kids.