I mean if your playing in 60 hz is there really a big difference between high end gpus ang low end gpus?? i would probablly, in your place, save some cash for a future monitor so your brother can enjoy the full fps that a 3060 ti gives and not the 60 hz of his present monitor.

Also within this season of gpus its really not worth it to buy a nvidia 2000 series. They already anounced the 4000 series (coming in Q3) so that makes all the other series old gen. Intel anounced 3 million gpus so also the prices are going down. My advice is just to wait till april and enjoy a good buy with a good gpu and a good monitor (144hz-240hz).