Answer:
3
Step-by-step explanation:
Look at it this way. The grandma is the mother of the mom. The mom is the daughter of the grandma. the mom is also the mother of the daughter, and the daughter is the daughter of the mom.
So, if there are 3 members,
- grandma - is the grandmother ( of the daughter) and a mother ( of the mother)
- mother - is the mother (of the daughter) and the daughter( of the grandma)
- daughter - is the daughter of the mother
So there are 3 members in the family.
Btw, sorry if the answer is a bit unclear, but it's a bit hard to explain.
Anyway, hope i helped you understand this think-outside-the-box sort of puzzle :)