Tax client (mother) has an 18 yr. old son at the end of 2021.  The son was in school for 6 mos. of the year, then got a job.  The son earned $37K and the mother (self-employed) earned $41K before expenses.  Can the son be claimed on his mothers return?  I think the issue could be the support by the mother.  The son lived with his mother the whole year but the son bought a new truck.  The mother also received for 6 mos. child support from the son's father.  Legally divorced since 2013.