My question involves criminal law for the state of: Nevada

Ok, so my fiance was sexually abused by her father from about the age of 9-14 when she finally reported him to the police so he went to jail, got out on bail, fled to Mexico, my fiance's mother fled as well with the children in fear that CPS would take her kids away thanks to her husband's brothers because they convinced her they would because of what had been happening in her home for all those years(even though she had no idea). Point is the bastard died 5 months later in a car accident.
My fiance is 18 now, the oldest of 4 children. He made a lot of money when he worked because he was in charge of making houses and selling them. He probably had somewhere between $250,000-$600,000 in the bank when this occurred, he also had just made the plans to buil an apartment complex, he had blueprints and stuff ready so he probably had some loans out as well. The problem is he did not have a will because he died at a young and unexpected age. I believe he was 36 when he passed away. My fiance and her mom went to a probate lawyer. He said that there was nothing he could do really because my fiance's father had signed a letter of attorney which asigned his brother all legal rights over his estates, but only while he was alive. Unfortunately, being the snake that he is, he took all his money, changed the lots that he knew of over to his name and sold his houses to another one of their brothers, even though the money that was claimed to be paid by the other brother is nowhere to be seen.
When my fiance's mother took the kids she left the key to her sister so she could go take their belongings out of the home as my fiance's family was sharing half of the house(literally split down the middle seperated by a wall). But when she went to take the belongings out of the home she was shocked to find the locks had been changed. A lot was left behind. A dirt bike, paintball guns, expensive TVs, china, all the house's furniture, an $8,000 'mini bulldozer'(don't know what it's called") a computer, a mobile home left on the property as well as a trailer that my fiance's uncles have remodeled and been renting out for years. Also my fiance's father had a good truck (not sure what kind), a good condition buick, and a minivan. The buick was supposed to be my fiance's when she turned 16, but her mother sold it before fleeing to mexico for only $400 (crazy right?) as she was desperate for money, the minivan was totaled when her father died since it's the car he was driving when he drove off the cliff, and truck unfortunately was passed on to my fiance's granfather because her father had his dad co-sign for some reason, so when he died it automatically went over to him, the reason I mention this is because my fiance has $2,000 worth of reciepts that was sound systems and stuff he put into that truck and we would love to recover at least that from the truck. She also has the titles for the mobile home, trailer, and proof of purchase of the 'mini bulldozer' thing. She also has some reciepts for stuff that was left in the house when her uncles stole everything from their home. There's also a lot of land or two that her uncle didn't know about so it remained in her father's name, which means they can claim it.
My fiance and her mother have been going back and forth for the past three years between the court, family court, anda bunch of lawyers that just keep telling them there's nothing they can do. Is there a specific type of lawyer we need to get to straighten this out? The bar of lawyers hotline didn't help AT ALL. We have all the paperwork we could possibly need, all we need is to get pointed in the right direction. Her uncles need to be put in their place. My fiance's mother contacted them and tried to talk things out with them. They told her they weren't giving her anything, what they would give the kids whatever they felt like giving them when they turned 18, all but my fiance because they hate her for putting their brother in jail. Oh, her mother and father weren't married anymore, but they had been together when all that stuff in the begining happened, and the probate lawyer appointed her as the administrator of whatever they could get through probate...even though he didn't claim anything for them.
You might be wondering why I'm so interested in resolving this when it could be non of my business. Well, I am very close to her mother and siblings and I care a lot about them. We're not only fighting for what is rightfully hers, but what rightfully belongs to her siblings as well. How fair is it that my fiance's family is struggling in a two bedroom apartment, being behind on rent all the time in danger of being homeless, struggling to find ends meet, when their very own uncles are rolling around in money that is supposed to belong to those children. Their poor mother can't afford to give them $1 for the ice cream truck while their cousins get cell phones, good clothes, and anything they want. This shall not go unpunished, those people have no conscience.
Please help this family out, they really need it, they've gone through too much to just continue suffering....

P.S: we also believe some fraud may have been comeitted because one of her uncles tried to change the title of the trailer to his name when my fiance's mother had the original, and some of the dates whn her father supposedly signed some document don't match up because he was alreay in mexico. (We have proof of when he was in Mexico becaus efirst thing he did was obtain his Mexican driver's license and we have copies of those documents)