I have an 11" iPad Pro and I use the exact combo that your family member uses. I have a folio case and a Magic Keyboard... and depending on what I'm doing, I will alternate between the cases. What's so nice is that it's so easy to switch between them. I store the iPad, and both the magic keyboard and folio inside a tomtoc sleeve (the iPad is inside one of the "cases" while the one not being used is just put in the case along side. Everything fits perfectly, together with a pencil. The charger does not fit inside the case nor the external pouch, but I generally put that in my backpack. Here's the case I bought. Highly recommended!

https://www.amazon.com/dp/B01KHJOXOM?psc=1&ref=ppx_yo2ov_dt_b_product_details