Making up the prayer

Question: If a person misses the two rakʿahs of Fajr because the congregation has already begun, should he perform them after the Fajr prayer? And if he does, is that performance or make-up?

Question: If a deceased person stipulated in a will twenty expiations for prayer, what is the amount of that expiation?

Someone asked me about a man who grew up among ignorant people who paid no attention to the laws of Islam. From the time he reached the age of legal responsibility he would leave the prayer; he would not fast...