Tristan Thompson has hammered out a paternity settlement for his second-youngest child -- where he'll shell out monthly ... TMZ has learned.
Sources with direct knowledge tell us ... Tristan Thompson and Maralee Nichols have agreed to terms for Theo, their 1-year-old son. We're told Tristan will pay $9,500 a month in child support and also covered some of Nichols' lawyer fees.
The $9,500 may seem low considering his NBA contracts have totaled $100M over the span of his career -- but he isn't currently on a team and therefore not earning income, and income is the operative factor in determining child support.