The house was an inheritance from a trust so not a sale and not on good terms with the other parties.  

Stephanie I know I am late to the party but there are certain tax implications with HELOCs, I would make sure you understand those before diving in. 

Just got off with an investor who was about to wire us money from Yieldstreet but his account with them is now frozen until further notice.Apparently they use a third party to escrow all funds and that company has just filed for bankruptcy.This is really unfortunate for those investors who are exposed. 

The Intermediary can then sell the note to any party, including the seller or a seller's family/friends.

Is there a third-party company that offers Damage Protection coverage for midterm rentals?

Yes, the lease renewal signed by both parties is just enough.

Cash App is acting as an agent transferring between two parties(the banks), as such, is a cash transaction.

this is the risk of having Multiple parties in title.. sure would have been better for the Dad to simply sell it to you and take back a recorded DT or Mort   with you and your partner on the Deed. 

If they use third party companies for these services?

Would you advise a third-party payment processor to be used?