Answer:
The correct option is (C)
Explanation:
To be able to claim somebody as a dependent, the person has to qualify 4 tests. They are:
If a person who is not a lineal descendant to be claimed as a dependent needs to be a part of taxpayer's household for 365 days (whole year).
In this case, taxpayer's cousin is not a lineal descendant. Rest of them (sister, father and son-in-law) are lineal descendants. So, cousin has to stay with the taxpayer for the entire year.