Withdrawals from GST

My father set up a Generation Skipping Trust, which is a broker account, and has a Trust (EIN) number.  I take a small amount out of this trust to establish / fund a 529 Education Fund for my grandchildren each year, which I am allowed to do.  I do not get a K-1 from the broker, and do not know how to report this in TurboTax.  I have reported this as "Other Income" in the past, but it does not track back to the Trust, so I get letters from the IRS.  How do I report this correctly?