If I had 5 sons, I would definitely make sure that their names are somewhat similar. I mean 'similar' as in a certain theme, like names that are equally traditional, or belong to the same ethnic group, etc. I would not go for something really obvious and unimaginative, such as making them have names that all start with the same letter or something.
That said, this is what the sibling set would roughly look like:
1. Rupert Wilhelm
2. Wolfram Faramund
4. Christian Kunibert
"How do you pick up the threads of an old life? How do you go on... when in your heart you begin to understand... there is no going back? There are some things that time cannot mend... some hurts that go too deep... that have taken hold."