My major is computer science. I'm senior and I want to apply for PhD in CS.
I have 2 recommendation letters right now. One is from a professor that I previously worked with. The other is from one of my MATH course teachers. Most universities require at least 3 recommendations.
My plan is trying to gain 2 more recommendations by working with 2 more professors in my interested area which is kind of difficult(I can get one but I don't know whether I will have time for the second). Based on my experience, the strongest recommendations are acknowledgment from professors that I worked with. So I would like to have 3 this kind of letters to be my main recommendations.
My cousin said that he will convince some of his friends and partners who are successful entrepreneurs to write recommendations for me. It may help since some of them may be trustees of some universities. But I'm really hesitant right now. I don't know what number range of recommendations is considered appropriate. Also, I have a really good relationship with my cousin. I don't want to turn him down if these letters will cause some negative effects.
Can someone give me some advice?