@Cody Sims
A 1031 Exchange requires that your Dad, the taxpayer, purchase a Iike kind property. Since he is selling in the US, this can be any real property in the US that going to be held for business, investment, or trade use.
Yes, he can purchase multiple properties of different sorts (single family home, commercial building, DST, Mineral Rights, etc.)
One important thing to keep in mind: in order to defer 100% of the capital gains taxes, one would have to spend ALL the cash proceeds from the sale of the property and purchase equal to or greater than the net sales price. Net sales price is the sales price less closing costs like agent commission, escrow fees, transfer tax, and recording fees.
I would recommend talking to a Qualified Intermediary for specific advice. Your dad will need a QI in place to facilitate the 1031 exchange. Dave Foster is always a fantastic resource in this community. I would also recommend Excel1031, Weiming Peng, I have personally worked with him on many complicated exchanges.
Shoot me an email if you have any follow-up questions.