Property Rights

My father passed away on December 2013. The house that we presently reside is registered on his name ( Father ), my elder brother 1 (Age 19 at the time of Registration and studying, my elder brother 2 (Age 14 at the time of registration and studying and he his Handicapped), - All the payments were made from dads account, this registration would have been done for convenience only but My mom ( Aged 74 ) is still alive and we are four of us; myself (45 yrs ), my elder brother 1 (55 yrs ), my elder brother 2 ( 50 yrs ) and my elder brother 3 ( 47 yrs ). All 4 of us are married and settled. Its been 17 Years to his demise. I would like to know the following 1. what is the % of share on the house for all 4 of us and my mom as well.? 2. Does the property needs to be re-registered? If so, what is the deadline before which the property needs to be re-registered as its been over 17 years since my father's demise and in whose's name it needs to be re-registered? 3. Can the property be registered in all of our names or can be registered to only one person? 4. What is the complete process involved in re-registration of the property? 5. Since our business was together no partition also happened