Explanation:

Correct option 5 : Can't be determined

Step 1: Basic Info
S is married to A, who is mother of G → A is female

R is sister-in-law of A → R could be:

S’s sister or

Wife of A’s brother
→ So R’s gender is female, but S’s gender is not confirmed

Step 2:
K is grandson of P and only son of R → K is male

P has one granddaughter → G or someone else could be female
→ But G’s gender is not directly stated

Step 3:
Only K is clearly male

S’s gender is not known for sure

G’s gender is not confirmed either

Final Conclusion:
We can’t be certain how many male members are there.

Correct Answer: 5. Can’t be determined