Shall I delete my fingerprint on iPhone?

My brother goes on my phone at night with my fingerprint. Like when I'm sleeping he takes my finger and puts it on the home bottom. He keeps doing it. He only done it once. I was so angry when I found out. I like the finger print because it's so easy. I don't want my brother going on my phone because I private stuff on there? What shall I do?

Use an easy password combo that just goes straight down

people think i'm sophisticated and use a really obscure pattern combo but its so simple

You could also delete the private stuff. Just put a simple password in it.