It gets ugly fast.

Move half of whats in the bank to your account before the person youre dumping beats you to it and takes everything. WHAT you think this is illegal - ITS NOT - its a shared bank account, you both signed the other person can do with the money whatever they want. Leaving half for them is being generous and will help you to remove them out of your daily life as fast as possible.

After you have your half of the money. Go straight to the lawyer. Listen to their advice. Do not get spiteful. Do not get revenge. Just get out of the marriage and divide the asaps and child visitations ASAP. Everything else will drain you. Dont fall for their lawyer constantly demanding information or financials.

Now your demands and get them. Dont fart around in courts wasting $100k or more.

Step 1 - GET YOUR MONEY OUT NOW Step 2 - GET AND LISTEN TO YOUR LAWYER AND SERVE THEM BEFORE THEY SERVE YOU. Step 3 - Do not get vengeful. Just get our of the marriage ASAP. Step 3 - THEIR FAMILY IS NO LONGER YOUR FAMILY. YOU ARE NOW AN ENEMY TO THEM. UNLESS ABSOLUTELY NECESSARY PREPARE YOUR MIND YOU WILL NEVER SEE THEM AGAIN. Step 4 - DO NOT RELINQUISH A GODDAM THING. This is yours and yours kids house now. THEY gotta go. Boo Hoo, fuck them.

Good luck.

Sorry for typos, but this is straight facts. Been there, done that.