Source is DailyNK on this one. This South Korean site is run by defectors, for defectors, so it's not exactly neutral.

>The latest round of separated family reunions ended earlier today... Participants from the North are set to return home via Pyongyang, where Party and security officials will question them over the course of approximately two weeks.

>During this time, the North Korean reunion participants are given tours of Pyongyang, which offers the chance to judge whether they have become ideologically suspect, and moreover what items they have returned with from the reunions. Participants must report any cash or products they may have received...

>Approximately $100 received is normally surrendered to the United Front Department in the form of “loyalty funds," while returnees must also pay for their lodgings in Pyongyang... After participants return home from Pyongyang, they must give further payments to those gatekeepers who helped them gain access to the reunion event in the first place: State Security Department officials, the Peoples’ Security Ministry, and Party cadres...

The Party can't even keep its fingers out of the last visit between elderly family members.