Child custody

You need to establish an age-appropriate parenting plan for *both* children. You say you have "joint custody" for the littlest one - what does that...

When my mother passes is there anyway my ex can get any of the money I inherit?

Your question is unclear- were you ever married? If you weren't, the only financial obligation to your ex is child support. Child support is based...

Is this huge increase in rent legal?

Sadly, it's completely legal. You could try to negotiate with the landlord, but I would document everything and look for a new place.

Will I have to pay her father child support even though I have zero income coming in for myself?

In Colorado, child support is dependent on the parties income and ability to pay. I don't think you indicated that there is a child support order...

How would I defend against a diss. of marriage (common law) petition that I never consented to, nor desired to be a party to?

You can contest the petition, and it will be up to her to show proof that you held yourselves out as married. If you can defeat the petition then I...

Can I minimize what expenses are ran through my attorney? If I can even get awarded attorney fees does mom or the attorney pay?

This may not be the answer you're looking for, but if you're unhappy with your attorney, you can always find new representation. Or you can...

Can we argue that since the $1399 lease is the most recent document signed by all of us, that our rent should remain $1399?

You are only bound by what's in the lease. Demand that they keep to those terms.

Do I have any chance of annulling the marriage?

No. Annulment is generally only in cases where the marriage was a fraud. You can file a response to the Petition correcting the place of marriage-...

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What can i do? What kind of Representation do i need?

You need an Adjudication of Parental Responsibilities hearing, as well as a determination of child support. I'd consult an attorney.

Is it legal for my ex to use the wording of our Parenting Plan to his advantage?

Yes, it's legal. You can offer a trade if he's open, but keep in mind that offer is probably subject to a notice provision in your parenting plan....