No, you do not have to do the same thing as your sisters.

Q: Sadly, our Mother passed and there are 4 of us kids listed as equal beneficiaries. My sisters want to take their ¼ share in cash. Do I have to take my portion in cash also?

A: No, you do not. If you wish to open an Inherited IRA, you may do so. Each beneficiary may do as they wish with their own inherited portion.

disclosures:http://www.hechteffect.net/?page_id=31