You can book tickets for a maximum of six(6) people under a single booking, however for tatkal booking, you can book only upto four(4) tickets. This number includes children and senior citizens traveling together. Additionally, two children below 5 yrs are allowed but not ticketed. You need to specify the details for these travellers as well (though they wouldn’t be included in ticket details).
What is the maximum number of people I can book train tickets for under a single booking?