The term paternal grandparents refers to the grandparents on the father's side of a person's family tree. According to Dictionary.com, a person's paternal grandparents are his father's parents.
Requirements around employee benefits are first based on the number of full-time employees a company has. If the company is an Applicable Large Employer (ALE), an hourly employee becomes eligible for benefits if the number of hours they work meets or surpasses full-time work. The Affordable Care Act and the IRS define a full-time employee as one who works at least 30 hours a week or 130 hours a month on average. Employees who will be working full-time should be offered benefits based on the company's Waiting Period.
Part time is a label. I worked a job where they said I was part time, to keep me from getting benefits, even though I was working 40 hours. Since benefits are a company choice and not required by law, they can set the rules of how many hours you have to work to qualify for benefits. Most companies set it at 32, but I've seen better places say anything over 20 qualifies for benefits. The employer decides what is part time.