elder

elder adjective uk/ˈeldər/ us   elder brother/daughter/sister, etc
B1 the older of two brothers/daughters/sisters, etc

старший брат/старшая дочь/сестра и т. д.
Their elder daughter lives in South America.

ELDER noun

uk/ˈeldər/ us  the elder
B2 the oldest of two people

старший (из двух)
He's the elder of two sons. your elder s
people older than you

старшие
I was taught to respect my elder s. [ C ] an important, respected, older member of a group

старейшина