*ǵenh₁- [kin]

kin
←ME kyn
←OE cynn (“kind, sort, rank”)
←PWG *kuni
←PG *kunją (“race, generation, descent”)
←IE *ǵn̥h₁yom
←IE *ǵenh₁- (“to produce”)

father
←IE *ph₂tḗr
*peh₂- (“to protect, shepherd”) +‎ *-tḗr (agent suffix)

mother
←IE *méh₂tēr
*ma (“mother”) +  *-tēr (agentive suffix)?

brother
←IE *bʰréh₂tēr
*bʰréh₂ or *bʰrḗh₂ + *-tēr (agentive suffix)?

sister
←IE *swésōr
*su-h₁ésh₂-ōr
*swé (“self”) +‎ *h₁ésh₂r̥ (“blood”)?
*swé (“self”) +‎ *-sōr (feminine-noun-forming suffix)?

son
←IE *suHnús
*sewH- (“to give birth”)
"birth, fruit of the body"

daughter
←IE *dʰugh₂tḗr
←IE *dʰewgʰ- (“to produce”)
originally meaning "the (potential) suckler, the one that draws milk"?

Compare Sanskrit दुहे (duhé) / दुग्धे (dugdhe)), +‎ *-tḗr?
दुहे
to milk, milk out, squeeze out, extract
to yield, produce
←IE *dʰúgʰs
←IE *dʰewgʰ-