Hello, the following are the main specifications needed to play The Sims 4:
OS
Windows XP (SP3), Windows Vista (SP2), Windows 7 (SP1), Windows 8, or Windows 8.1
64 Bit Windows 7,8, or 8.1
Mac OS® X 10.7.5 (Lion)
Processor
1.8 GHz Intel Core 2 Duo, AMD Athlon 64 Dual-Core 4000+ or equivalent (For computers using built-in graphics chipsets, the game requires 2.0 GHz Intel Core 2 Duo, 2.0 GHz AMD Turion 64 X2 TL-62 or equivalent)
Intel core i5 or faster, AMD Athlon X4
Intel Core 2 Duo 2.4Ghz Processor or better
Memory
At least 2 GB RAM
4GB RAM
Hard Drive
At least 9 GB of free space with at least 1 GB additional space for custom content and saved games
10 GB of Hard Drive space
DVD-ROM
DVD-ROM drive required for installation only
Video Card
128 MB of Video RAM and support for Pixel Shader 3.0. Supported Graphics cards: NVIDIA GeForce 6600 or better, ATI Radeon X1300 or better, Intel GMA X4500 or better
NVIDIA GTX 650 or better
NVIDIA GeForce 320M, 9600M, 9400M,ATI Radeon HD 2600 Pro or better. Video RAM of 256MB or better.
Sound Card
DirectX 9.0c compatible
DirectX
DirectX 9.0c compatible
As long as your son's desktop meets these requirements, then there should not be a problem.