Regulus/Sirius at school

[lziner]

No: HPFGUIDX 80715

After reading post #807803 about Regulus Black, it mentioned that 
Sirius and Regulus may have been at Hogwarts together.  I can only 
wonder how they "got on " at school.  If Sirius was the height of 
cool (along with James), where was little bro Regulus in the pecking 
order?  OR is it possible he went to another school - Drumstrang - 
perhaps?

Just wondering if anyone had any thoughts on this.
Lziner