White All you care about it getting a loan using your house a collateral

I've been looking into HELOCs, home equity loans, cash-out refis, and cross-collateral loans. 

I would assume the private lender has the house as collateral and can foreclose on it.

Many people don’t mention it but you are pretty much putting up your home as collateral and if you miss a payment bank will come after your home.As a beginner I would be reluctant to use my parents home or retirement..Make sure you have a backup plan or contingencies if things don’t go as planned..

A lot of banks have introductory rates for HELOCs that they use as a loss leader for the branch and you can shop around for the lowest rate or any bonuses they have because its the cheapest money you can borrow.Once you have that line of credit, rather than utilizing it as collateral for downpayments on leveraged properties, I would use it to leverage the strength of cash offers on distressed properties ideally to motivated sellers that allow you better access to good deals compared to those with financing contingencies.

He kept calling for more money which I said I don't want to provide him any more money against his lawsuit and I asked him if he had any land as collateral.

That guarantee means you are promising everything you own as collateral if the loan goes bad. 

I was thinking about offering 12% interest only payments on a 12 month term as I am using the brrrr method and will refi out to pay off the loan. 1 member asked me about some sort of collateral like name on the title which i said i didnt want to do, but it made me think what about some sort of lein on the property during the loan?

It's a lot harder to sell one of the assets in the group since it's contributing collateral to the overall loan.

A lot of questions here...As your dad has a 50% interest, and a trust owns the other 50% of which you and your two siblings are the sole beneficiaries (I presume), it might be advisable to, after the trust interest is distributed, to have your father, you, and your siblings contribute your interests to an LLC in exchange for shares of the LLC (usually called "units").The property would be re-titled in the name of the LLC and the LLC can use it as collateral for a loan.It's usually highly advisable to engage an attorney to draft an operating agreement in this scenario to get everyone on the same page about ownership interest, who is/are the managing member(s), what happens when someone wants to sell -- do the existing members get 'right of first refusal', what happens if a member passes away, etc.