continuous Part Time Then Full Time

Hi.. I want to ask I worked at my Relative office for 2 years continuously during my school for the first 4 months I worked full time (40 Hours/week) then for about 15 month I worked part time (20 Hours/week) then for last 6 month I worked again full time since I graduated.

My Job was mainly of doing computer repairs, printer repairs and check up, website, data entry it is an architecture engineering company, and I finished my B.Sc Degree in Electrical Engineering where I did this job during my studies and I continued with it for 6 month after graduation.

I am now about to complete my first year as a student here in Canada, and I want to apply under skilled worker.

First Question: Can I claim this as a 1 year Full Time Continuous Job??

Second Question: Would I face any problem thats the office is for my relative "Same Family Name" knowing that I was as any normal employee.

Third Question: What kind of papers I have to show to prove this knowing that I was paid in Cash Money.

Thanks.