Answer:
a) Winston lives alone, but he maintains a household in which his parents live. The mother qualifies as Winston’s dependent, but the father does not.
Determination of Filing Status: Head of Household
Reason: It is enough, if one parent is qualified as dependent
b) Winston lives alone but maintains a household in which his married daughter, Karin, lives. Both Karin and her husband (Winston’s son in law) qualify as Winston’s dependents.
Determination of Filing Status: Single
Reason: Head of house requires that the dependent be a member of taxpayer's household
c) Winston maintains a household in which he and a family friend, Ward, live. Ward qualifies as Winston’s dependent.
Determination of Filing Status: Single
Reason: The dependent must meet the relationship trust
d) Winston maintains a household in which he and his mother in law live. Winston’s wife died in 2017.
Determination of Filing Status: Can qualify as Head of Household
Reason: If MIL is his dependent, he can qualify for Head of house
e) Same as part (d), except that Winston’s wife disappeared (i.e., she did not die) in 2016.
Determination of Filing Status: Married - Separate
Reason: He is still married, he cant file as head of household