Final answer:
In a patrilineal descent group, a person's relatives are traced through their father's line, which makes 'FaSi' or Father’s Sister the correct answer.
Step-by-step explanation:
In a patrilineal descent group, the relatives are those traced through the father's line. The person who is considered a relative in such a group would be option B, which is 'FaSi' or Father's Sister. This is because the patrilineal system traces ancestry and lineage through the male line, including your father, his brothers (your paternal uncles), and his sister (your paternal aunt). Other options like MoBr (Mother's Brother) or MoSi (Mother's Sister) would not typically be considered part of the patrilineal descent.