Indeed, household general troupes do not necessarily have eight members. They may have four, six or eight, or even as many as 10, 11, 12 or 13. It's just that groups of eight are the most commonly seen, and this is why everyone is accustomed to calling them the "Eight Household Generals."
的確，家將團的成員不一定是八個，它可以是四個、六個、八個成陣；也可擴大到十人、十一人或十二、十三人皆可，只是八人的編制較常見，因此大家習慣叫它「八家將」。