What if I told you that I've been stealing small amounts of money from my brother and I think he's catching on?
Why would you want to steal from your brother?
HE has more money than me and I need it.
Stealing from your family is as low as someone can get. You should apologize and repay all you have taken.
I'm going to just take it and deny it was me.
Eventually, they will catch on, for sure. It is a habit that you need to try and fix because stuff like this never lasts and your family will just end up avoiding you. Plus, you will just get filled with guilt later, so it's better to just stop stealing now so you don't end up destroying your family's trust.