What Are You Doing, Half-Sister?
This is like stuff out of the soap operas that mom used to watch during the day. How is it that your older sibling, someone you’ve known your entire life, isn’t what you believe? Learning that your older sibling is actually your half-sibling has to be pretty soul-crushing.
If she’s your half-sister, that could mean one of your parents isn’t your biological parent. It could also mean that one of your parents cheated on the other! And you know what that means, don’t you? Neither do we. You could try to learn who your real bio-mom or -dad is if you want, we guess.