If I could clarify, one member of the opposition is what we're saying. It could be any one of the parties, but in order to have that reduced quorum, there has to be one member of the opposition there--not one member from each party, just one member of the opposition. There could be two.
Evidence of meeting #1 for Agriculture and Agri-Food in the 40th Parliament, 2nd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was chair.
A recording is available from Parliament.