When did Penny and Ivy last appear in an episode. Didn't they do a couple episodes in season 2? Also when was Brendon's last appearance?

Josh Bryne left when Lilly was born b/c there were 2 many cast members. As 4 the 1st part, i'm not sure Penny/Ivy's last episode?

Tiff7

Brendan stops appearing in season 6. As for Penny and Ivy, their last episode was "Beauty Contest". (The last episode of season 1)