When someone dies and you inherit their property,are you automatically put on the deed? or do you have to pay?

My mom died a few years back and when she died her 60% share of our house was split 30/30 between my brother and I. My question is this: when that happened, are we automatically a part of the deed, or did we have to go to a courthouse or whatever and pay to be put on the deed? Our names are on the tax papers we get or the house, so it seems as though we'd have to be on the deed. How would they know we own 60 per cent otherwise? Also, I spoke to a lawyer on the subject a few months ago and he gave us a rundown of the deed which states that on the day my mother died, her interest in the house ped to my brother and I.