Not really in my opinion
Because in a rich family, the children might not have the
opportunity to care for everyone in the family. The reason is
because he is rich, he dont really need to look at how people live,
and from there he will try to be better than the other kids to make
their parents proud(That is also somewhat a form of filial
piety)
However, in a poor family, the children see things from a more
reality point of view, mostly from the parent's point of view, who
needs to earn $$ to support the family. If a person is expose to
this from young, there will be an 'understanding' that there is a
need to earn cash to life. Thus, when people see that most of the
time the people who are working(because the reason he
or she give is to support their
parents) is a poor kid, they might presume poor kids are
more filial
ACtaully is depend on what the child is expose to, and how much
he is exposed to what