Wow! You're situation was identical to mine, exactly the same, aside from the field.

I am an attorney, graduated law school in 2013. During school I interned (summer associate) at my dad's firm as well (during 1L and 2L summer). He has a decent sized firm (70-80ish attorneys) in a big city.

I felt the exact same way as you. I was the managing partners son, and felt as if people didn't respect me, or acknowledge the good work I'd do, I was just [Dad's name] son. I was plenty qualified to work there, so in my mind, I didn't feel it was blatant nepotism, though never had to interview. It always felt awkward, I constantly felt judged, and didn't even fit in well with the other summer associates. So what did I end up doing?

After I passed the bar, he instantly offered me a fantastic salary (95k + bonus), they generally pay 1st year associates about that, so not out of the norm.

I expressed to him my concern about working there, and it potentially being detrimental towards my passion for the law. Along with that came on of the hardest decisions I've made. Not just from a financial aspect, but the sadness in his voice upon declining his offer, I felt horrible, but deep down, I knew it was the correct decision.

Subsequently, I went on the job hunt (didn't do shit waiting for bar results), I got quite a few rejections, but also a number of interviews (a few of which were connections through my dad, I'll admit). But in the end after about 3 1/2 months after passing the bar, I got a great job, I absolutely love the firm, and just feels "right". I took less money, but stayed in the city where my law school is located.

With all of that said, I know the exact feeling you're experiencing. We are in different fields, but my advice would be continue the job hunt, and know you have your dad's offer if you really cannot find anything you're happy with. I know different fields, but I just had to respond, it's kinda freaky the similarities. Anyway, good luck to you OP!