The term "uterine kins" refers to the siblings one has through the mother, rather than through the father. Synonyms for this phrase include "maternal siblings," "siblings through the mother," and "mother's side siblings." Other variations could include "uterine siblings," "maternal-side siblings," and "siblings by birth from the mother." It's important to distinguish between maternal and paternal siblings, as this can impact genetic predispositions to certain medical conditions and inform family history in medical contexts. Understanding the language used to describe these relationships can help individuals better communicate their family history and health risks with medical professionals.