I Appreciate Honesty

I've gotten caught up in some of my parents sh*tstorm of financial oddities. In short, my mom is accusing my dad of stealing from a public account for my brother and I, meanwhile my dad keeps saying how unstable she is and how she's been basically plotting against him for a while now (which, as I've learned is partially true is some small ways). Because the finances portion especially feels so relevant to me, I've gotten myself deep into the situation. I have screenshots of bank statements and the strange transfers of money DO come out of the account my dad is accused of stealing from. (I spent all of this night so far doing the math and double checking stuff)

Here are my dilemmas:
1. The money in the account for my brother and I wasn't made by me and my brother. It was made by my dad. We live with him, so if he spends it and moves it elsewhere to other accounts, it is still slightly in the loop of supporting my brother and I. Although our monthly credit card comes to an average of 4 thousand CAD, which seems pretty damn high for a monthly bill, some of this magically disappearing money IS spent on my brother and I. Is it valid to still accuse him of such a horrible sounding thing?

2. Do I actually want to know more? I feel like I can barely trust either of my parents because they've both lied at times, so in that sense I want to know the answer to all this insanity. Should I keep digging, solve it, side with one parent and eventually forgive the other when everything is in the light of day? Or, let my parents work it all out themselves and endure my dad ranting about how crazy my mom is till it's all over or I get sick of him and move out?

It's complicated, and I don't know what to do. I really wish both my parents could just be sane with each other sometimes.