“Perfect love casts out all fear” 1 John 4:18

So how do you know when the enemy has someone in your family convinced that they are not loved? It will be very obvious by their words and actions. You will know it because they will criticize and even crush you with their words, and will do things that seem to be deliberate rejection. Stand firm; you must remind yourself it is not the person, but the enemy working through them. Pull out the strongest ammo, get ready, aim and rapid fire love towards them.
What I mean by rapid fire is to show them love in various ways all within a few hours of each other. Like a phone call in the early morning, an encouraging text at lunch, then, invite them for dinner in the evening accompanied by a thoughtful gift. At dinner find ways to affirm their gifts and abilities and encourage them to use their gifts in creative ways. After several days of very strategic rapid fire the enemy will be overcome and the family member you thought you had lost will be won.