craigslist? Options

[batman]

So I'm on talking terms with my mother again and she freaked out when she learned I was living in an apartment based on an ad off craigslist. It's a temporary sublet until December, so I don't really have a written contract. It's just a "give half the rent" to my roommate month by month type of thing.

It's convenient, but I guess not the smartest thing I've ever gotten into.

She's demanding to see a copy of my roommate's written lease now and wants me to "get a receipt" after giving him rent.

Idk, I've been here for a little while and I met up with him before agreeing to live here. It doesn't seem like he's in it to screw me over. But since it's not down in writing, I guess he can technically kick me out at any time, but at the same time, I can also just up and leave without bothering to pay... so I'm not sure.

Should I probably ask to get a written contract? Have any of you gotten a job or an appt off Craigslist?