I'm 90% sure they bought a few hundred thousand of those. The channel only released videos since June of 2016. Way back then it was mostly lets plays and vlogs. They brought nothing new to the table in either of those over saturated markets and they were pretty generic. Yet somehow, they made around 300k subs in their first three months. That's really rare. Incredibly rare. It looks suspiciously like they bought subs

Here's their social blade, scroll to the bottom to their sub graph to see what I'm talking about.

To see what a more natural sub graph should look like, here is H3H3 and here is ethan and hila. Both start small and grow steadily.

There are possible explanations to this though that don't involve buying subs. If these guys where well known before they started uploading on this channel, you might see a graph like cowchop's. In cowchop's case, they were well known on their personal channels and other channels so they got a massive initial sub boost when they started. If DaddyOfive was well known before that, it would make sense as to why we see that big boost. I haven't found any trace of an old fanbase though. They may have also made older videos that they deleted but I didn't find any evidence of that either. No comments asking why X was deleted, no explanations anywhere, nothing. My money is that they bought the subs.