Answer: Andrew
Explanation: Andrew can claim Zach as a dependent because Zach lives with him, and at Zach's age where he cannot earn his own living, Andrew is responsible for him financially throughout the tax year while Lacy stopped living with Zach on September 25.
To claim a dependent on a tax return, you have to be responsible financially for the person. Other factors that make claiming child as a dependent possible are:
Relation by blood or marriage.
Age: under 19 or less than 24 if a full time student,unless he/she is disabled in which case there is no age limit.
In addition, only one person can claim a person as a dependent. So in this case both parents cannot claim Zach as a dependent, only one can.