Politicians’ family as signalling

In the US, if you look at political candidates in public view, they often appear with family in tow. A candidate’s family plays an important role in the election campaigns. I’m from India. There, the politicians’ family play little role in election campaigns (unless the family member herself is actively involved in the party and politics, which is often). But, the relative importance of family (relative to other aspects like money, education) in the cultural value system of India is significantly greater than its relative importance in the cultural value system of the US. So why the inverse relation?

I think it may have to do with signalling (inspired by Hanson, Zahavi). Maintaining a stable family is considered to be less of a status quo situation in the US, when compared to India. So in the US, maintaining a stable family is a signal of your management skills at the level of family, because you had to spend effort to obtain that signal. But in India, the family does not have signalling value, because it is much more common to have a stable family. So having a stable family did not require an ‘extra’ effort (extra compared to society’s default).

What would this imply? How would one test such a theory?