The person I am asking about is the father in this story. A friend who is strugggling with whether his father is saved told me this story:
A man divorced from his long time wife and got full custody of his four children who were all then very young. The man takes his children to a local church Sunday School every week of their childhood. The man sits in on the church service that is held while his children are at the church's Sunday School program for children and the man hears the Gospel preached every week. Eventually, all the children hear their father say before they start high school that he believes in Jesus, that he believes he died for his sins, that he believes he rose, that he believes reigns over all things as risen Lord of all. The father said "I am a Christian". That was in early 2005.
The father struggles with loneliness when his youngest child starts high school especially as all his children come to him for help/support less and less. He registers on an online dating website. In late 2005, he finds a non-Christian female and starts a relationships with her. He soon invites her to live with him in an unmarried sexual relationship. He gradually withdraws from his involvement in church and spends more and more time with her.
Despite their repeated attempts, the father insists his children should not criticise his relationship with her outside of marriage while they are living under his roof. One of their unsuccessful attempts tried to involve the pastor of the church he had become less and less involved with. This only strengthened the father's resistance to correction. His children attempt to leave home as soon as possible as they are unable to stand living with a man who is living in sin and so strongly refuses correction even though he is their father.
All his children leave high school, and start and finish university. Immediately before the youngest childen of his from his former relationship with his ex-wife leaves home, that youngest child asks him whether he still believes in Jesus, that he died for his sins, that he rose, and reigns over all things as risen Lord of all. He says yes, and that he still believes himself to be a Christian.
A week later the father of the four children died as a result of a stroke. That was in 2017. In total, the man's out-of-marriage sexual relationship under the same roof with his girlfriend lasted more than a decade. But he has been claiming to be a Christian for also more than a decade even though he had no qualms about living in a sexual relationship with someone outside of marriage for almost all that time. He refused to say his sexual relationship, outside of marriage, with that female he met through an online dating website was wrong all the way up until he died.