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\t\t\t\t<\/p>\n The latest episode of Young Sheldon<\/strong><\/a><\/em> finally solved a mystery from The Big Bang Theory<\/em>, seven and a half years later.<\/p>\n For those who don\u2019t know, Young Sheldon<\/em> is a prequel series to The Big Bang Theory<\/em> and it follows the younger years of Jim Parsons<\/strong><\/a>\u2018 character Sheldon Cooper.<\/p>\n In the season 10 episode of The Big Bang Theory<\/em> titled \u201cThe Hot Tub Contamination,\u201d Sheldon explained why he always knocks three times before he enters a room. <\/p>\n He told Penny, \u201cI was 13 years old, and on spring break from college. My mother was in bible study, I walked in the house expecting to find it empty, and I heard a sound coming from my parents\u2019 bedroom. When I opened the door, I saw my father having relations with another woman\u2026 We locked eyes, I ran to my room, and we never, ever spoke of it.\u201d<\/p>\n Well, Young Sheldon<\/em> finally revealed who Sheldon\u2019s dad was with in bed.<\/p>\n Keep reading to find out more\u2026<\/em><\/strong><\/span><\/p>\n It was actually Sheldon\u2019s mom Mary!<\/p>\n In season 7\u2032s fourth episode, which aired on Thursday (March 7), we learned that 13-year-old Sheldon came home from college and only knocked on his parents\u2019 door one time. He opened the door to find them doing the deed. <\/p>\n Sheldon might have thought his father was with another woman though because his mom Mary was dressed in clothes she brought home from Germany, including a blonde wig. Sheldon\u2019s parents were doing role play and when he walked into the room, his dad was saying, \u201cOh, Helga!\u201d <\/p>\n Narrator Sheldon explained, \u201cI never talked to my parents about what I saw that day. But from then on I added extra knocks so people could get their pants on,\u201d according to TVLine<\/a>.<\/p>\n Did you see that CBS has officially ordered a Young Sheldon <\/em>spinoff series<\/a> with two actors reprising their roles?<\/p>\n <\/span><\/p><\/div>\n