What is the Surname of Barbie Doll?

What does this mathematical rebus means ?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

I am sure no one can have two things for dinner. what are they?

How many bananas can you eat if your stomach is empty?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Count the number of triangles in the given picture.

Solve the mathematical equation in the picture below.