At this time, I can only offer a partial answer.I will try to find out more and will post what I learn, when I learn it.
A retired Idabel Police Officer recalls that the killings was located at Kulli Tuklo (called Kulli pool) park.He didn't recall whether or not they were fishing, but there is a pond there.He didn't recall the outcome either, but said the case had been investigated by the OSBI.I am familiar with that area and won't bring my family there.There have been a number of killings there, for several reasons.
Now ... I found a barely legible obituary for all three in the McCurtain Gazette Newspaper.It seems they had a combined funeral service and were all three buried in Maple Springs cemetery (services conducted by Baker Funeral Home).
The obituary indicates that Patrick wasn't a brother, but was a cousin ... his full name was Patrick DeWayne Warhop (born 19 Dec 1962).Robert L. Brown (born 28 Feb 1958) and Andrew L. "Sid" Brown (born 8 Apr 1957) are both shown as being survived by their father Andrew Brown and several brothers with the last name Warhop.But for Patrick, it lists him as being survived by his mother in OKC, and brothers named Warhop (different than those of Robert and Sid).
Further ... Robert was said to have had three children: 2 daughters - LaShandrea, Mylice, and a son Robert Jr.Andrew was said to have had three sons:Synica DeWayne, Michael, and Antwian.
When (and if) I am able to find out more, I'll let you know.