@Arpanjot0
As long the booker is also the person who is going to stay, it should not be a problem
BTW Be sure not to mis the weekly discount (if any for a 7 nights or more stay)...otherwise better your brother book the whole trip.
Also two bookings means technically:
2 cleaning fees (if any)
double reviews
Multiple check-in/ check-out times...
Possible preparation day after each booking, so after the first booking there is a availibility problem for the next night...or even worse: somebody else books !
So best to inform the host that the two bookings are for the same party, so the host is prepared.
best regards,
Emiel