Running of HUF

My father wants to start the HUF, but my brother, sister, wife, and kids don't want to become members of this HUF.

1. Can I become a member of my father's HUF without my brother, sisters and my wife and my kids?\
2. If HUF earns through Equities /Mutual Fund, what is the tax implication of the same? For example, HUF earned 15 lacs through short-term and 10 lacs from long-term. How much tax liability for the HUF? How the office expenditure needs to be deducted from salary ie Driver cost /Maid Cost / Cook cost, and other expenditure to run the HUF