Yes, your employer can be blood related to you as long as they pay the employee and have a job offer to complete the document checklist for the pathway HCCP or HSWP. This information is actually in their website.
@ richmond08 , what other documents IRCC with ask from Employer apart from this Offer of employment?
Work experience (part-time/full-time) while studying full-time is not considered in the HSWP. If you can get PGWP after studying then you can work full-time while waiting for the new work permit under HSWP even if your PGWP has expired - implied status. Also, you can apply as soon as you have completed the document checklist for the pathway and don't need to wait 1 year work experience.