First and foremost, Happy holidays and Merry Christmas ya filthy animals. 

Now, I'm 21 and times have gotten a little rough for my family financially. I have agreed to pay them $700 for rent and money I owe each month. They have offered the entire upstairs apartment to me but I'd rather the room I have on our lower floor. 

My parents are great, honest people but I have this gut feeling that I should be recording my payments to them for some reason. I would like to whip up a little log that has the date, the amount paid, and both of our signatures. 

I feel like it is a responsible thing to do but things like this  could seriously offend them (especially my mother). In a way I feel as if it chips at the trust and honesty that we are trying to maintain. How should I go about this without being an asshole?