>>>>My sister is eligible. If I were to identify as a woman I could be a member too. What are the benefits?<<<<
Yes, Andy, according to the current rules, you could be a member
Go here to learn about the benefits: https://www.dar.org/
But what about gender fluidity. Suppose for part of the year you identify as a woman and the other part of the year you identify as a man. Do you only need to pay 1/2 of the amount of annual dues?