No organizational papers need to be filed. General partnerships are not useful for estate planning. Parents want to transfer property to their kids to avoid its inclusion in their taxable estate, but they do not want to give up the control that goes with that transfer of ownership. Also, the unlimited liability of all partners is an unacceptable risk in most families. They have two classes of partners - general and limited.
General partners run the business, regardless of the percentage they own.
They have unlimited liability. That means that if partnership property were insufficient to satisfy creditors, any other, individual property of the general partners could be at risk. In the typical FLP, these are the parents. Limited partners have no control and limited liability - their amount at risk is limited to their ownership stake. In the FLP, the children are the limited partners.