Which is the best sister constellation in Pisces?

Pisces' heart is unknown, because they often live in their own imagination, or stand in the middle between reality and imagination. Capricorn and Taurus are the easiest to become friends with Pisces. They are not very good at expressing their horoscopes, so they can understand Pisces' hidden feelings, help Pisces face the reality and strive to realize their dreams in reality.