I bet the standard trope of overly confident siblings, arrogant wives, and condescending father will come all at once.
Also I can't understand why he would want to go to a magic academy when, as he has noticed, the talent of magicians has clearly fallen. He would likely not be able to gain anything other than access to books for other elements, but I doubt most of the teachers would be able to teach him anything beneficial.
I tried looking for the web novel to scan a bit and I guess it's already been deleted.
@Kikaibaka you're probably right. Also, the test probably influenced the lack of progress in magic because "if you don't have the talent, why try? And if you do, you're superior and don't have to worry about getting better since you have an affinity. So still, why try when you're talented?"
@Qwaser5r he's thought of as being "talentless" and was forced into a house in the middle of nowhere with his mother. I already feel the incoming drama that's going to happen from the other mothers and children.