Family members must strive mightily to overcome the spirit of the world operating in their lives. God exalts those who humble themselves and humbles those who exalt themselves. In spiritual direction I often ask very elementary questions. It is not merely emotions, chemistry and so on. Love is a decision, an act of will.
Love desires the highest and best thing for the sake of the beloved.
If you love your wife, your husband, your children, your parents, you must desire heaven for them. Some would hold that this is too simplistic. I remind them that God, by definition, is pure simplicity. Each must have the eternal salvation of the others at hand. Don't complicate the matter.