Yes - having multiple businesses does not prevent you from claiming the Employee Retention Credit for multiple businesses. In fact, a group of entities that shares common ownership is what the IRS calls a "controlled group of entities". Controlled group of entities is treated as a single employer for the purposes of the Employee Retention Credit.
With our ERC Calculator, you can quickly see if your business qualifies to receive ERC.
“For purposes of determining whether an eligible employer is a large eligible employer or a small eligible employer, eligible employers are not required to include full-time equivalents when determining the average number of full-time employees.”