Under what joint screen credit were the Olsen twins billed in Full House seasons 2 through 7?

Under the joint screen credit Mary Kate Ashley Olsen, the Olsen twins were billed in Full House seasons 2 through 7.

Mary-Kate Olsen and Ashley Olsen alternated in the role of Michelle Tanner, the youngest Tanner daughter. Because they shared one television character, the production needed a way to credit both performers without drawing attention to the fact that Michelle was played by twins.

The unusual combined credit served that purpose. Rather than listing the sisters separately as Mary-Kate Olsen and Ashley Olsen, the opening credits used the merged name Mary Kate Ashley Olsen. The credit began with season two, when the twins became more prominent in the show’s cast, and continued through season seven.

Viewers commonly remember the credit as “Mary-Kate and Ashley Olsen,” which is the sisters’ familiar public pairing and the standard way their names are written. That is not the specific joint screen credit asked about here. The spelling and punctuation may appear differently in references, but the canonical merged credit is Mary Kate Ashley Olsen. The twins were separately recognizable outside the show, later becoming major stars and entrepreneurs.