More than three decades after Little House on the Prairie star Michael Landon died, Melissa Gilbert is still thinking about the lessons he taught her.

Gilbert, who played Laura Ingalls Wilder on the beloved series, marked what would have been Landon’s 90th birthday with an emotional tribute to the actor who played her TV father, Charles “Pa” Ingalls. But her message went well beyond remembering a former costar.

For Gilbert, Landon was a major influence during some of the most formative years of her life.

“Ninety years. I wonder what you would think of that,” Gilbert wrote in an Instagram post featuring photos of herself and Landon.…