In a certain code language,
‘P * Q’ means ‘P is the father of Q’,
‘P # Q’ means ‘P is the sister of Q’,
‘P + Q’ means ‘P is the brother of Q’,
‘P = Q’ means ‘P is the mother of Q’,
‘P − Q’ means ‘P is the son of Q’.
Based on the above, how is P related to R if ‘P * Q = R’?

Symbols

*

#

+

= 

Relations

Father

Sister

Brother

Mother