It's just wrong

There is so much wrong information on Ancestry.com it isn't even funny. People can put whatever they want on there and others regard it as truth. In my own case a niece showed up that I didn't know I had. She apparently didn't like the relatives she grew up with and hired someone to find something better. They picked my deceased brother, who as far as I know had one son. My nephew bought everything she said and decided to connect as a half sibling with the woman, who is 20 years or so older than he is. I would think he would at least question it. Instead, he accused me of not welcoming her into the family.