None of the opinions given on this question, except my own, goes through each of the three fonts of morality, and each of the types of cooperation, in order to determine the morality of the act…
Mr. Conte–you seem fixated on using three points, while ignoring the critiques of your analysis on points 2 and 3. If it helps you understand better, I’ll spell out my objections using the three points you sited.
- Intent: The intent to help a family member is good. But as the saying goes, the road to hell is paved with good intentions. We must carefully examine the next point–help a family member do what? Help a family member rob a bank? Not good.
- The Act Itself and its Inherent Moral Object:
Moving a tv maybe morally neutral, but, for example, moving a tv as part of a robbery is clearly
wrong. Likewise, helping an unmarried couple move their stuff into a “shack up” situation is
wrong. The objective of this particular move is to move an unmarried couple together into a morally objectionable situation. Even apart from the sin of sex outside of marriage, an unmarried couple living together is morally wrong.
Also note, this is not just about the sister but* the sister’s daughter*. The intent of moving a girl in with an adult man–who I assume is not her father-- puts the child at increased risk for molestation and abuse. (Not accusing anyone, just making a statement based on child abuse statistics.) Not good.
- **Circumstances **
Nothing in the circumstances described lead me to conclude the good outweighs the bad. Quite to opposite: I believe the bad outweighs the good.
Living together creates scandal–for the woman’s child, for the neighbors, for the other members of society. That scandal is not simply avoided by having mention the objections to the sister–because
actions speak louder than words. Helping them move in together gives direct help and physical support for their cohabitation, even if one verbally claims not to support it.
The father who plans to help might be injured by all the heavy lifting even if the op did help with the move. That’s all the more reason for the father not to help with this morally objectionable move either.
It may cause some strife in the family–but it will likely only be temporary. In the long run, the op can rest peacefully knowing he/she did not help place his/her sister and niece in a morally compromised situation. As other circumstances arise, the op can help the sister in other ways that do not compromise morals.