I went to an excellent healing retreat. It is just great when God enlightens a truth to us thru a gifted speaker who helps us break thru ungodly beliefs that some time creep in.
In Exodus God makes a covenant on passover when they place the lambs blood over the doorpost which protects the whole household from the spirit of death. Just like for us Jesus has shed his blood and as it says in Acts, believe on the Lord and you and your whole house shall be saved. The glory of God is corporate, for the whole household.
 
I think the big problem is that we focus on the here and now and then disbelief steps in when we do not see immediate results. It is good to know that our relationship with God is based on his promise and his does not waver even though we may by disbelief.
 
As far as those who are adrift in your family, remember the situation with Abraham and Lot. Lot was not exactly right with God, he was a little wayward, not wanting to leave sin city. Yet Abraham exerted faith for Lot which brought Lot's deliverance.
Why can't we have that same sort of faith for our wayward family members?
 
When we give up on family members we bring curses against them which only causes more trouble. I think we need to be able to see beyond the present and trust God that he shall keep his promise. Even Rahab the harlot or prostitute could see this law of God as she covered her whole family by choosing to turn to God.
 
We tend to forget that God is a covenant God, a God who keeps his promises. So he is pleased when we trust him even when things don't look so hot.
 
God bless
frank