I dont like this vague "general" warnings. I expected something way different on a way worse level and mentally prepared for it. And yeah, I involuntarily read stuff where I WANTED a warning, but didnt get it and cant erase it out of my mind. But here we got "this". My opinion:
you can give such a warning and imo its ok, but describe the scene with a small spoiler warning, so the reader can decide to read it or not. Also if I would have skipped it, some interactions without father and son would have been missed by me. Sure, not really important here, but could have been. If you care about a trigger warning, you could care about exact pages where and what happens too.
Yeah yeah, I know, I didnt pay for it, its just my opinion you can receive however you want.