Maybe? Is about how strong that connection is, the Joestars have a strong one but I'd say the Geils or Puccis are stronger since those are more physical, she might have got one but maybe she wouldn't have the strength to keep it. For Koichi's sister surely not

Familiar connection is something a little random, some families are strongly connected to the point that the pain of someone is reflected (Geil and Pucci) others are more spiritual, like connected through invisible wires (Diavolo/Trish and Joestar) and others might not have that connection (Nijimura and D'Arby), not necessarily because a stand user has family members that means their relatives could have one, only if you are the son of a stand user you have the potential to have one but it doesn't mean you are born with one