Not sure where my reply went so here we go again.

OP here, it’s my fault for neglecting the detail yes brother will properly check in as my co-guest, register using his passport and stay in one of the hotels. There’s nothing out of ordinary nor illegal about it.

My question solely relates to whether ONE individual can register to stay at two hotels at the same time, for the same duration, in Beijing.

My brother and I need two hotel rooms and I want two sets of elite night credits, that’s all.

Edit: we both have valid visa etc., I thought my question was clear on that... my bad