splitting an Inherited IRA

I'm the sole beneficiary of a recently deceased parent's traditional IRA. Although I was listed as the sole beneficiary, I intend on splitting the IRA with my siblings. My question: What are my options for distributing the funds and sharing with my siblings. Can I just do the lump sum and send 1099 to my siblings for their portions? OR Can I roll it over and pull out a specific amount each year (to avoid the higher tax bracket) and gift them the money?