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I read a fairytale in The Complete Grimm's Fairytales, but can't find it again. What I can remember of it is this: There is a queen with 12 sons (or some similar number) who is pregnant. Her husband, the king, says that if the 13th child is a girl, he'll kill all of the sons. The queen doesn't want to tell her sons, but one of them notices that she is depressed and asks what's wrong. She then shows him a room "with 12 little coffins" and explains it all to him. They decide that the boys will run away and live in the forest until the baby is born. When it is born, if it is a boy, the queen will raise one colored flag from a high tower and they can come home. If the baby is a girl, the queen will raise a different colored flag and they will stay in the forest. The baby is a girl and when she is about 12 or 13, she wanders into the forest and comes to the house where her brothers live. The brothers have vowed to kill the next woman they see, as revenge for having to leave their home. However, when she gets to the house, only the youngest brother is home and he finds that she is his sister, and doesn't want to kill her. He tells her to hide when the others come home and then convinces them not to kill the next woman they see. They promise, the girl comes out, and they live happily for several years. One day, the girl is working in the garden and pulls up some plants and all of her brothers turn into swans (or another type of bird). I can't remember the next bit very well, but somehow the girl ends up married to a prince, but unable to speak for seven years, so the enchantment on her brothers will be broken. The girl's mother-in-law, slowly turns her son against the girl and makes him think that his wife doesn't really love him, because she won't speak. They start to burn her at stake for being a witch, but at that very second the seven years of the curse end and her brothers turn back into men and save her.
If anyone knows the name of this fairytale, I would love it if you would help me.