The Brady Bunch (1969)

S3E13 The Not-So-Rose-Colored Glasses

Jan accidentally grabs the wrong bike from school, which leads to her struggling with her grades. As she faces this challenge, she discovers that she might need to get glasses. Meanwhile, Mike plans a special anniversary surprise for Carol: a portrait featuring all six kids. The real challenge, however, is sneaking the children off to the photographer without Carol catching on.