G3609–οἰκεῖος–oikeios

So then, as we have opportunity, let's do what is good toward all men, and especially toward those who are of the household of the faith.

οἰκείους oikeious “of the household”

So then you are no longer strangers and foreigners, but you are fellow citizens with the saints, and of the household of God,

οἰκεῖοι oikeioi “of the household”

But if anyone doesn't provide for his own, and especially his own household, he has denied the faith, and is worse than an unbeliever.

οἰκείων oikeiōn “[their] household”