Blair is not an illegitimate child. Blair and his sister are truly henry's children. They are not Vanessa's uncle's children. It was Blair's mom's misunderstanding!! Unfortunately his mom finds out about it after Henry (her husband) passes away. Blair had a child with his fiancee who looked exactly like henry which confirmed this. Blair's mom got drunk and didn't know properly who made her pregnant which led to her misunderstanding. Also Henry had infertility issues this made it seem like blair and his sister were illegitimate but it's not true it was confirmed near the end of the book!
Blair is not an illegitimate child. Blair and his sister are truly henry's children. They are not Vanessa's uncle's children. It was Blair's mom's misunderstanding!! Unfortunately his mom finds out about it after Henry (her husband) passes away. Blair had a child with his fiancee who looked exactly like henry which confirmed this. Blair's mom got drunk and didn't know properly who made her pregnant which led to her misunderstanding. Also Henry had infertility issues this made it seem like blair and his sister were illegitimate but it's not true it was confirmed near the end of the book!