legal advice needed!

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okay here's the deal, my uncle got into a rent to own deal with no contract. well the owner threatened to take the house away if my uncle didn't give him 30,000 right now, well my uncle has crappy credit and asked my mom if she would do him a favor and get a loan for 56,000 and just pay off the owner so it'll be my uncles house! my mom agreed, my mom and uncle r on the deed but my mom's the only one on the loan, now my mom got an equity line to pay off some bills, but is making the payments and it'll get paid off in 10 yrs. she didn't think it was a big deal b/c she was paying it and my uncle was never going to sell or anything! well my uncle found out when he opened up my mom's junk mail that was sent to his house and found a letter to refinance that equity line! he flipped out, he says my mom forged his signature and that was illegal b/c she didn't let him know, and now he's threatening to sue, he already called a lawyer, and the free consultation a few days ago said they can freeze my mom's assets in 2 days and unfreeze them once this is all over. Now my question is, did my mom do anything illegal, she can get a loan without his permission right, especially if the first mortgage is only in her name? will she have to pay his lawyer fees (that's wut the consultation lawyer said)? can they freeze her assets even if he's wrong until the proceedings r done? another thing, his wife is here illegally, and she's a felon, so is there a number we can call to get immigration on her within a heartbeat if he does go further with this? is it against the law for him to open the letters in her name sent to his house?