@Samantha Soto
California has taken steps to address this issue and have have even codified certain real estate related restrictions in the Business and Professions Code.
Your father may have an easier time deciphering this code but take a look at this link of the California Business and Professions Code:
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=bpc&group=10001-11000&file=10130-10149
Pay particular attention to the following:
Section 10130. It is unlawful for any person to engage in the business of, act in the capacity of, advertise as, or assume to act as a real estate broker or a real estate salesperson within this state without first obtaining a real estate license from the department...
Section 10131. A real estate broker within the meaning of this part is a person who, for a compensation or in expectation of a compensation, regardless of the form or time of payment, does or negotiates to do one or more of the following acts for another or others:
(a) Sells or offers to sell, buys or offers to buy, solicits prospective sellers or puchasers of, solicits or obtains listings of, or negotiates the purchase, sale or exchange of real property or a business opportunity.
(e) Sells or offers to sell, buys or offers to buy, or exchanges or offers to exchange a real property sales contract, or a promissory note secured directly or collaterally by a lien on real property or on a business opportunity, and performs services for the holders thereof.
Based on the above rules, only a broker or salesperson can solicit buyers and sellers, market property, negotiate real estate contracts, and sell real estate contracts for another person. So, if you actually buy the property first and then sell to another, then you are not violating this part of the law.
However, the Code further states:
10131.1. (a) A real estate broker within the meaning of this part is also a person who engages as a principal in the business of making loans or buying from, selling to, or exchanging with the public, real property sales contracts or promissory notes secured directly or collaterally by liens on real property,...
(b) As used in this section:
(1) "In the business" means any of the following:
(A) The acquisition for resale to the public, and not as an investment, of eight or more real property sales contracts or promissory notes secured directly or collaterally by liens on real property during a calendar year.
(B) The sale to or exchange with the public of eight or more real property sales contracts or promissory notes secured directly or collaterally by liens on real property during a calendar year. However, no transaction negotiated through a real estate licensee shall be considered in determining whether a person is a real estate broker within the meaning of this section.
Accordingly, it appears that even if you act as a principal (meaning you are acting on your own behalf and not for another person), then you are limited to 8 transactions per year, otherwise you are acting as a broker.
This response neither constitutes legal or tax advice nor establishes an attorney-client relationship. Inquirers must seek the advice of their own legal counsel prior to undertaking any course of action related to this inquiry.