Single contact split
How do I split one contact into two contacts? I have my sister in my phone as a contact but my niece uses her iCloud address to talk to me. When I message my sister, it is sent as an iMessage and my niece receives the message on her iPad since my sister has an Android. I’ve tried removing the iCloud address from my sister’s contact card and creating a new contact with just that address. However, the messages are still combined in my messages and automatically select the iCloud address by default when I want to text my sister. How do I remedy this?
iPhone 11 Pro Max