Two Scarecrows

Tom, Dick and Harry are sitting in a cornfield, in which there are two
scarecrows.
One of the scarecrows (S1) lies midway between Dick and Harry,
while the other one (S2) lies midway between Tom and Harry.
Tom is 8 yards from S1, while Dick is an integral number of yards
from each of Tom, Harry, S1 and S2.
Assume that no straight line can go through all the 3 guys.
What are the possible distances of Tom, Harry and S2 from Dick?

If Tom is also an integral number of yards from Harry,
can you find a solution?

If no answer exists for part 2, can you find a distance
between Tom and S1, such that all distances are integral?
Source: Created by reader Sudipta Das.
Denis Borris suggested an extension to this puzzle:
Tom, Dick and Harry are sitting in a cornfield, in which there are three
scarecrows. One of the scarecrows (S1) lies midway between Dick and Harry,
another (S2) lies midway between Tom and Harry, and the 3rd one (S3) lies
midway between Tom and Dick.
The distance between any of the 3 guys is even.
The distance between any scarecrow and any guy is also even.
DistanceTom:Dick > distanceTom:Harry > distanceDick:Harry.
Distance Dick:Harry is at minimum. Find the above 3 distances.
Solution
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