No, you do not have to prepare a Schedule C unless you had business income related to these purchases or are claiming a business deduction.
The 1099-MISC only reported that they had sold you a significant amount of product, possibly a heads-up to the IRS that you were making wholesale purchases and may be selling the product without reporting income.
This is the tax reporting requirement for the vendor:
In addition, use Form 1099-MISC to report that you made
direct sales of at least $5,000
of consumer products to a buyer for resale anywhere other than a permanent retail establishment (box 9).
Unless you sold the merchandise for a business purpose (to make a profit), you don't need to report anything.
Keep good records about any deposits you made with reimbursements from your family.
