Melissa Gilbert’s little house just got bigger. The “Little House on the Prairie” alum, 62, announced on Instagram Stories Thursday that she recently discovered three biological brothers on her mother’s side, calling the last few weeks “remarkable.” “A few weeks ago I connected, trough [sic] an app with my fifth biological cousin on my birth mothers [sic] side,” Gilbert wrote. “His intrepid research let [sic] me to my biological siblings on my birth mother’s side. “I found out I have three: Matt, Laird, and Mark (who unfortunately has passed away),” she wrote, calling her older brothers “fantastic human beings.” Melissa Gilbert, seen here in 2023, discovered she has three brothers through her biological mother’s side. Getty Images The actress wrote in an Instagram post that she always want