There is probably enough information to uniquely identify this case.

1) 8 year old boy dies in non-motor vehicle accident.
2) 12 year old kid involved.
3) Father commits suicide 4 years later.

How many deaths satisfy just #1? After a bit of searching it's around 100 a year. If this happened 10 - 30 years ago we're talking about 20,000 cases. According to information theory we need about 11 more bits of information to uniquely identify something in that.

Number of other kids involved is probably like 0-3 so 2 bits. Ages of those involved going to be like 4-20 so that's 4 bits. Something happening 4 years later is like 3. A suicide probably only occurs like 5% of the time so that's another 4. The father committing it and not the mother is 1. 2+4+3+4+1 = 14 bits or so.

If OP valued staying anonymous I hope some of those facts were fudged (which would greatly reduce their identifying content).