Bob and Jane, brother and sister, are equal partners in a family partnership that owns 400 shares

Question:

Bob and Jane, brother and sister, are equal partners in a family that owns 400 shares of the Sibling Corporation. Their grandfather owns the remaining 100 shares of Sibling Corporation. How many shares of stock are owned directly and indirectly by Bob?
Partnership
A legal form of business operation between two or more individuals who share management and profits. A Written agreement between two or more individuals who join as partners to form and carry on a for-profit business. Among other things, it states...