Parole in Place for mom please help!!!!

Anyone know of a good law firm here in Los Angeles that can help my mom out. My brother is in the Marine Corps and we’re looking to not get scammed but want to make sure this works. A lawyer that helped my uncle charged him $13,000 for a Parole in Place and his papeles, which to me seems like too much. He has no criminal record, came illegally, never been to prison, never deported etc. just like my mom. Another place is charging me $3,500 for a Parole in place and $3,500 for her papers, and they have good reviews but I just don’t feel too secure for whatever reason. They are called Diener Law Firm. Has anyone heard of them? Any advice can help!