your dad was required to take an RMD in 2012. if he didn't the beneficiary was required to take it. can you explain why you did not"inherit" the IRA until 2015? IRAs have a designated beneficiary and many have a secondary beneficiary in cases where the owner and primary beneficiary die.
for 2012 if dad did not take an RMD for that year, the beneficiary should have taken it.
the rules for RMDS in subsequent tears would be based on the rules in effect in 2012.
