The people closest to you — parents, siblings, grandparents, and the rest.

• matermotherfeminine (3rd decl., mater/matris)
• paterfathermasculine (3rd decl., pater/patris)
• sororsisterfeminine (3rd decl., soror/sororis)
• fraterbrothermasculine (3rd decl., frater/fratris)
• aviagrandmotherfeminine (1st decl.)
• avusgrandfathermasculine (2nd decl.)
• filiadaughterfeminine (1st decl.); dat./abl. pl. filiabus to distinguish from filiis
• filiussonmasculine (2nd decl.)
• amitaaunt (father's sister)feminine; paternal aunt specifically
• materteraaunt (mother's sister)feminine; maternal aunt specifically
• patruusuncle (father's brother)masculine; paternal uncle specifically
• avunculusuncle (mother's brother)masculine; maternal uncle specifically
• familiafamily / householdfeminine (1st decl.); originally the whole household incl. servants & property
• parentesparentscommon-gender plural of parens (parent, either sex); 3rd decl.
• fratres et sororessiblings (brothers and sisters)Latin has no single word for 'siblings'; you list 'brothers and sisters'. Sg. frater/soror as needed.
• consobrinus(male) cousin (esp. on the mother's side)masculine; strictly the maternal cross-cousin (mother's-sister's son). Paternal-side male cousin = patruelis. Often used loosely for any cousin in later Latin.
• consobrina(female) cousin (esp. on the mother's side)feminine of consobrinus; strictly the maternal cross-cousin. Often used loosely for any cousin in later Latin.
• infansbaby / infantcommon gender (3rd decl., infans/infantis); lit. 'not yet speaking'
• maritushusbandmasculine (2nd decl.); also vir 'man/husband'; coniunx = spouse (either sex)
• uxorwifefeminine (3rd decl., uxor/uxoris); coniunx = spouse (either sex)