Just wondering, when you apply for the job they listed German as a requirement? Because I wouldn't accept a Job if knew I wont be able to communicate with anyone. Now if they say english is Ok, then you need to speak to your manager to help you handle this. Because the lack of communication from your coworker is affecting the ability of doing your job. — Juan Carlos Oropeza 48 secs ago

Yes, I know what you mean I'm also a programer and my native isn't english but everything is in english so have to learn it. But you need to speak to your manager. If they claim they have English culture and now result is only German you are a victim of bait and switch. Polish your resume and start looking for another job where the culture fit better for you. — Juan Carlos Oropeza 58 secs ago

What exactly is the problem with just not inviting them? Maybe I'm reading this incorrectly, but your father just said you should invite them, he didn't do it himself or anything, correct? — Raditz_35 1 min ago