Here's an example of what what woman is dealing with because she loves her half-brother.
We have been "dating" for years now. Even now. I chose him, and I will never throw that away. But problems like difference in years, which I never thought would show. I am older, my friends are getting married, or are married with children. I can not marry. I can not even tell anyone. I have to face questions like "what's wrong with you?" more and more often on meetings.So much trouble, and why? Because consenting adults are in love with each other. That is ridiculous. They should be free to be together, to marry if they want, and their families and friends should recognize the beauty of their love.
Loss of family also hurts the relationship. Turning your back to those who know to pursue it might form "bad blood" between lovers. His mother, and my mother both figured it out and tried desperately to keep us apart. Unfortunately, being the older one, both parents found me to terrorize.
My mother now stopped talking to me, and his mother has given up.