Kiddushin, Chapter Three, Mishnah Eleven
This is a direct continuation of yesterdays mishnah.
[If a man says to a woman], I betrothed your daughter, and she replies, You betrothed me; he is forbidden to the juniors [the daughters] relatives, while the junior is permitted to his relatives; he is permitted to the seniors [mothers] relatives, while the senior is forbidden to his relatives.
This mishnah provides the opposite scenario to that which we saw at the end of yesterdays mishnah. The man claims that he betrothed the womans daughter, and is therefore forbidden to the daughters relatives. However, the daughter is still permitted to his relatives, since neither she nor her mother claimed that she was betrothed to him.
The mothers relatives are permitted to him, because he doesnt claim to have betrothed her. However, she is forbidden to his relatives because she claims to have been betrothed to him.