cousin - verisor/verisoara
nephew - nepot/nepoata
stepfather - tata vitreg
stepbrother - frate vitreg
twin sister = sora geamana
mother-in-law = soacra
an only child = singur la parinti
foster parents = parinti adoptivi
in-laws = rude prin alianta
mother, father, parents, brother, sister, aunt, oncle, grandmother, grandfather, grandparents, twin brother, stepsister, stepmother, father-in-law, foster child (copil adoptiv), brother-in-law (cumnat), sister-in-law