Prohibited Transaction - IRA? Please help.

[Guest cease]

The owner of a traditional IRA purchases the XYZ fund through his IRA custodian. The purhcase represents less than 10% of the total IRA. XYZ Fund resides in a Limited Parternship that is owned and managed by the IRA owner's son and daughter (50/50 partners). The investment in the XYZ fund by the IRA represents 50% of the total value of the XYZ Fund.

Because of the purchase in an investment, where the investment is owned by the son and daughter of the IRA owner, has a prohibited transaction occurred?

Thanks!