Go back to the moonguile forest with a blank card. Then get some water and wash the dirt away from the sign next to the ruins. The sign says THE CAPTURE OF BIRDS IS PROHIBITED or something like that.You will then see a man with bracelet near the exit to the area that goes towardsd the area where you fought the dragon. Talk to him. He will ask you to help him with his research by helping him catch blue birds. Go up to the trees near the lizard and the red flower. Blue birds will fly out of the one tree. Now run towards the tree in the direction faces the man. He will catch some. NOw go talk to him and he will sign the family tree if you got it. Then go over to the cage with the dead bluebirds in and use a blank magnus to get one. Now just take it back to the girl get her signature on the tree then with hers you can get her dads.