My Jesuit guru in the old book on meditations wrote this week that God appeals to people, calls them to Himself according to their individual dispositions. Only God could appeal to each person individual personality. Only God would do this out of love.
We are all impatient, wanting people to be cookie-cutter Christians. We cannot imagine appealing to a various people, with extremely dispositions. But, God does, over and over and over. Only God would know a person well enough to try and bring that person to Himself in an individual manner.
So, for those parents who have been praying for lost children, or children praying for lost sibling, or even lost parents, take heart. God knows how to bring His chosen ones back to Him.
Pray that those you love who are lost will be open to His love.