Pray for family relationships – husband/wife, parent/child. Pray for the children, their salvation and spiritual growth, their health and education. Pray too that their family life will provide an excellent model for local Christians and the unsaved. And pray against the temptations that destroy families.
If your missionary is single, pray that God will meet his or her needs in this area. Pray for strong, healthy friendships, and contentment in singleness.