Father's adulteress affair

Well there's that and the fact the society they were in and the culture is very male oriented. It's based in Abrahamial social structure where women are to "know their place", so when women do something wrong the penalty is that much greater.

The fact that Sara's father was a former elder in the church (and became one again) also probably had something to do with him getting off easier.

"Bulls**t MR.Han Man!!"--Jim Kelly in Enter the Dragon

if the Father was repentant of his affair, he would be privately reproved or public reproved
difference is how well known was his actions known among the congregation or public
second, he would not be re-appointed an elder so soon
an elder who seriously errs with in an adulterous affair cannot serve for many many years and he would have restrictions on privileges like commenting or participating in other activities except preaching
so they got the information wrong
the elders in general do not want to disfellowship a member who confesses to serious wrongdoing. it all depends on the individual is they demonstrate a repentant attitude and have righted the wrong by their actions
if some one does not care about what they have done or doing, they are disfellowshipped from the congregation to protect them from their bad influence

True. Two people committing the same "sin" does not always get the same judgment(worst is disfellowshipping, second is public reproof in which the wrongdoer is announced/reproved in front of the congregation, then lastly private reproof or strong counsel)...

Different factors come into play when a "judicial committee" meets with the wrongdoer to decide the appropriate disciplinary action to take. The primary intent of the committee is to help the person to repentance. Extenuating circumstances are considered... was it premeditated or done deliberately? was it a one time act, a slip, or a repetitive offense? does the person show repentant attitude or rather defensive and justifies the sin? Did the person come forward to confess guilt or di he/she tried to hide it? also considerd is the extent of damage done(hurt parties, the resulting scandal, the reproach it brought to the congregation)...

All of it has nothing to do with gender.

Furthermore, it would take some time for him to be reappointed as an elder in any congregation. He was practically reappointed after a few weeks in the movie. That wouldn't have happened at all.

Exactly. Successfully being a JW and staying in, or leaving them and getting out, both take strategies if one wants to maintain one's rights, "priviledges," relationships, etc. Just games played in that Matrix.