Richard may be the only LIVING brother, but depending on the family tree, would not Lloyd's father also be an "uncle" to the same person that Richard is an uncle to?
Uncle is also used informally as any older, male, family member. In general, an uncle or father would be the one to go to for help getting out of trouble; the uncle might have just been closer. Was the father still alive in 1975? Planning such serious crimes with family members I think is less common, but Richard would know more about this.
But I think the "uncle" was just Lloyd as described in my previous post. With the father now dead from a motorcycle accident in the 70s or 80s?, the police would not worry about ruining his reputation or his life as if he was a living person, and I can't see why the police would not list him as a person of interest if they had even a hunch about him; one of his motorcycle or drinking buddies in theory could come forward say say, "he told me he helped his son bury bodies." Not that decades old hearsay, even if true, is good enough for a court.
I don't think Lloyd Wlech's criminal background would make it into court either. Even knowing what Lloyd was convicted of, many of the people here don't think it's him, much less beyond a reasonable doubt. IMHO, the police have an uphill case against Lloyd assuming his criminal background is inadmissible.
