Romans 10:14 NKJV
How then shall they call on Him in whom they have not believed? And how shall they believe in Him of whom they have not heard? And how shall they hear without a preacher?

Outline of Biblical Usage of heard

to be endowed with the faculty of hearing, not deaf
to hear
to attend to, consider what is or has been said
to understand, perceive the sense of what is said
to hear something
to perceive by the ear what is announced in one's presence
to get by hearing learn
a thing comes to one's ears, to find out, learn
to give ear to a teaching or a teacher
to comprehend, to understand

Matthew 4:16 AMP
The people who were sitting (living) in [spiritual] darkness have seen a great Light, And for those who were sitting (living) in the land and shadow of [spiritual and moral] death, Upon them a Light has dawned.”

Although we have shared the Gospel many times with family members, they need to comprehend and understand the need for salvation.

What we can mistake for a rebellion against receiving the Truth, can be that they don't really understand it.

Remember the god of this world has blinded the minds of unbelievers 2Cor 4:4

and his plan is to steal, kill, and destroy them John 10:10

Continue to pray for the scales to be removed from their eyes and deaf ears to be open, and also that their hearts are to be soften.

Pray, that when we have open doors with them, that your words are anointed and the truth of that word sets them free