How is applying the sins of one person to another who didn't commit them based solely on relation 'moral'?
We are talking about family here. I cannot imagine a family not apologizing to another family if one of theirs harmed one of the others.
Apparently, family and morality seem to mean little to many today, and while I am not a 'family matters' kind of guy, the actions of those of my immediate family are by extension my responsibility.
To put it into terms you might understand, not having a family, if your boyfriend of many years killed someone while driving drunk, would you apologize?