RMD long over due

[Dude]

Parent died in 2005 leaving IRA to taxpayer. Taxpayer received a 1099 R in 2010 rolling over the IRA to him. No distribution ever taken per the 5 year rule. Taxpayer just kept IRA incorrectly thinking the rules for a spouse were the same as rules for a child. Looks like an incorrect rollover. Any other option other than amend 2010 with 5329 and waiver request?

[Lion]

And, if a child and not a spouse, take out the funds ASAP so you can report that you did that on the 5329 with waiver request.